New HL7 ITS

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Dec 2, 2013 (3 years and 8 months ago)

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New HL7 ITS

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Table of Contents


1

Introduction

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2

1.1

Purpose

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...........

2

1.2

Summary

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2

2

Addressing implementation requirements

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.............................

4

3

Representing RIM objects
................................
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......................

5

3.1

Overview of data types differences from XML ITS R1

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5

3.2

Generic Serialization Models

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5

3.2.1

The mechanics of serializati
on

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6

3.2.2

Serialization Model Annotation Rules

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...................

7

3.3

Model
-
based validation

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..................

8

3.4

Providing alternative views of RIM
-
Based Models
................................
.......

8

3.4.1

UML views of RIM
-
based Models

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8

3.4.2

Simplified view
s

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....................

9

3.4.3

Representing simplified data type classes

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11

3.4.4

Semantic effects of simplifying

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4

Glossary

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12

5

Outstanding Issues

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12

Appendices

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13

A.

Supporting HL7 member organizations

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13

B. Tooling

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13

B.1

The RMIM Reshaper Tool

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13

C.

Model Annotation Syntax

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1

Introduction

1.1

Purpose

This document is intended to be a first draft of an
HL7 V3
ITS specification. It does
not repeat sections that would need to be
taken from the XML ITS specification, or
from the datatypes documentation that is provided alongside

it.

1.2

Summary

This specification describes the method for creating HL7 implementation models
using UML diagrams, XML schema, and (
when desired
) mappings betw
een an
alternative view of a message model and its ‘parent’ RIM
-
Based Model (e.g. RMIM).


It uses the same mechanisms to deliver two very different XML representations of
RIM
-
based information structures
:



Stable,
more
consistent
serialization

using generic

patterns such as Clinical
Statement for the XML element names. This
builds on

the succe
ss
of
the
stability of
the
CDA

approach to serialization
.



Reshaped structures where
a RIM
-
based model (e.g. RMIM)
is
‘simplified’ to
meet an implementer view requireme
nt (e.g. mapping to local data models or
supporting domain expert review)
.


The purposes of
the new
HL7 implementation models include:



Providing a stable and consistent
serialization

across different versions of the
same message definition, and between c
losely related information structures
(such as those derived from Clinical Statements, or a Pharmacy DMIM).



Enabling
clearer

m
odel
-
based
XML
serialization

for HL7 messages
(i.e.
exposing

all
serialization

‘rules’ within an implementation model).

o

Note
: Th
is will require changes to the HL7 Abstract Data Types
specification
.



Enabling i
mplementers to ‘simplify’ XML message
representations
to support
local business purposes while
be
ing

able to reconstitute the
appropriate
HL7
‘global’
(standard)
serialization

as needed. Simplification may include:

o

Creating a view of a message model using business information class
names (from domain analysis models) instead of RIM
-
based names,
for business expert review / validation of a message model.

o

‘Reshaping’ message mode
ls to collapse classes.

o

Excludin
g structural data
within
message models
classes
that are

not
considered useful in
a
particular
message model view (
i.e.
for a
particular purpose).



T
he use of UML
-
based tooling with HL7 implementation models (e.g.
for
viewing

or
for the purpose of
model
-
based automated code generation
).


A key component

for accomplishing these goals

involves t
he introduction of
V3 XML
Serialization M
odel
s
,
automatically generated
from
human
-
readable
annotations on
selected
RIM
-
Based Models (RB
Ms)
.
Serialization Models

are intended to

support
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consistent XML representations across HL7 V3 message types and also make the V3
XML ‘rules’ for serialization more explicit.


Serialization Models allow a message model to be serialized according to cross
-
message
generic
rules, as documented by the MIF representation of the
generic
Serialization M
odel as well as by ITS decisions documented as Serialization Model
annotations.


To support message ‘simplification’,
a prototype message reshaping tool
has been
d
eveloped and is described in Appendix B.
This tool can be used both in connection
with this ITS, and also to define ‘intermediate XMLs’ to help interface systems to the
previous ITS, as currently recommended in the HL7 Implementation WIKI.


HL7 shall decl
are only one
Serialization Model (SM)
for any given message type to
be normative.
One of the
RIM
-
based model
annotations will identify which
SM

is to
be used in its normative
serialization
.


Key
ITS
differences from the HL7 XML ITS R1:



Changed d
ata types
(to accommodate
UML representation, model
-
based
serialization and ease of use with commercially available XML tools
)



Use of
a limited number of Serialization Models

as the basis for determining
message

wire format
, in order to improve cross
-
message type co
nsistency

and
software programming stability
.

(The latter is a lesson learned from the
success of the CDA serialization approach.)




The optional use of UML views of any RIM
-
Based Model (Reference or
Domain, Constrained / Message Type or Local) or the Ser
ialization Model

for
various local business purposes (e.g. ‘business analyst views’, ‘local model
mapping view’)
.


The prototype tooling that is provided to support the proof of concept of this ITS may
also provide the transforms between (new) Serializatio
n Models and the XML ITS
R1.


HL7 methodology pre
-
requisites for approving this ITS

include
:



Approving the necessary data types changes



Establishing
and normalizing V3
Serialization M
odels to set
the wire format
rules

for all HL7 message
and document
desig
ns
.

(
Note
: This is likely an
appropriate joint work item between INM and MnM.)

o

Candidate Serialization Models include:



One for
all clinical domains (e.g.
CDA,
Patient Care
, Lab
)



Medications



One for Administration and Finance



Shared Messages

o

Limiting the nu
mber of Serialization Models should also
increase the
ease of
harmonizing
[creating consistent serialization rules for]
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common concepts across them (e.g.
the Clinical Statement Pattern,
CMETs).

2

Addressing implementation requirements

Implementers have found

that the XML ITS R1 includes some weaknesses, such as:



XML element names for the same concepts are different in related messages.
This is a result of taking the XML element names from RMIMs (message
models).



XML element names are inconsistent across di
fferent versions of the same
message. While this does make validation of individual message types easier
with schema, it makes it harder to create reusable message processing code.



Numerous changes to the data types within one ITS release. These are not
confined to ITS changes. There are places where modelling changes will
simplify implementation, but to maintain stability, it is important that such
changes are made alongside an ITS revision



The schemas generated produced by the (XML ITS R1) HL7 Generato
r tool
are not ideal for the production of WSDL specifications in the form that some
implementers would prefer. This is a result of the nested pattern used for
wrappers, rather than the use of headers.



A large number of fixed or defaulted data items in ma
ny message
specifications. The rationale for these were not well understood by many
implementers, who regarded them as error
-
prone overhead. The reciprocal
benefit of stable XML element names was not delivered, except in the case of
CDA.



Default values a
re not widely used in the specifications, because of a concern
that some implementations will not de
-
reference the specifications correctly,
so the instance must directly include all significant information. This
requirement that the instance can stand al
one has a high cost in terms of
message size, and also in an increased learning curve for implementers.


Explicit Serialization Models
, particularly if expressed in an industry standard
formalism such as Unified Modelling Language (UML)

should
be easier fo
r
implementers
to understand than a narrative specification. Reducing the number of
RIM
-
based models that form the basis for serialization rules should increase the
consistency and stability of wire formats encountered within a given V3 release.

Designin
g models specifically for the purpose of setting serialization rules may also
provide the opportunity for HL7 to ‘streamline’ the information it mandates is sent
‘over the wire’ in conformant implementations
(e.g. HL7 guidance to implementers
related to th
e inclusion or exclusion of structural codes required in a V3 message
instance has changed over time and is still not absolutely clear with respect to the
rationale given specific implementation requirements


i.e. it may be the case that
some domains requ
ire fewer ‘structural / semantic’ information in instances than
others).


Maintaining a set of Serialization Models that graphically
summarise
schema
information and support detailed annotations
for implementers
may also be easier for
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HL7 to
keep up
-
to
-
dat
e
and to link with other related policies and documents (e.g.
element name sorting protocols).


UML views of Serialization Models should support implementer requirements for
ease of interpretation
(using an industry standard model formalism)
and the potent
ial
use of UML
-
based code generation tools.


The changes to the data types necessary to support model
-
based serialization

should
also avoid some of the
hand
-
crafting and lack of commercial tools support
experienced in XML ITS R1.


This ITS also provides a
method that documents mappings between a ‘simplified’
model and its parent. This type of mapping should also support creating transforms
for translating between this ITS and XML ITS R1.

Such transforms may be necessary
in ‘hybrid’ implementation environm
ents.

3

Representing RIM objects

This section describes how this ITS depicts RIM objects. It is focused on R
IM
objects expected to be used

in XML serializations.


3.1

Overview of data types
differences from XML ITS R1

The following summar
izes

the
most significa
nt
changes proposed to the data

types.
These are fully documented in the separate datatypes proposal document.




N
ull flavor values

are reduced in number



An
IdentifierUse attribute
has been
added to II



E
ncapsulated
D
ata (ED) has been restructured to be
a
sibling of
String (
ST
),
rather than a child



An e
xplicit “data” component
has been added
for ED



XML attributes
are used
for address and name part categories rather than
XML element names




G
roup”
was added
to C
oded
D
ata (CD)

to support post coordinated
S
NOME
D terms



Explicit XML elements
were created
for sets, bags and lists


In addition, at this time t
here are a significant number of open data

type shange
proposals on the HL7 wiki. It is proposed that these be reviewed, and all those that
will not be address
ed in th
is release

cycle be explicitly
deferred

to avoid
implementer
confusion.

3.2

Generic Seriali
z
ation Models

This ITS proposes the development of V3 standard
Generic

Serialization Models, to
be applied to all XML serializations HL7 messages and documents.


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The creation of such models should stabilize and reduce the number of models
underlying what implementers can expect to see in a V3 message or document
instance.


As mentioned in Section 1, candidate
Generic
Serialization Models include:



CDA / Patient Car
e / Clinical Statement Pattern /
Lab /
?RCRIM



Medications



Administration / Finance



Shared Messages


For
convenience,
each V3 technical committee

may publish the relevant subset of the
appropriate
S
eriali
z
ation
M
odel for a given domain
.


A project team or t
ask force with members from INM and MnM may choose to
‘simplify’

Serialization Model
s

(compared to their parent RIM
-
Based Models) to
some degree
(e.g.

excluding specific fixed / default values,
or reducing the ‘depth’ /
flattening
some model classes as
tes
ted to be
appropriate

for this use
)
.


It is recommended (subject to INM

and MnM

approval) that
Generic
Serialization
Models remain normative for at least 4 years.


This ITS also provides a method that documents mappings between a ‘simplified’
model and its

parent. In addition to simplifying models, this type of mapping method
could also support creating transforms for translating between this ITS and XML ITS
R1. Such transforms may be necessary in ‘hybrid’ implementation environments.

3.2.1

The mechanics of ser
ialization

This section describes the mechanics of V3 serialization within this ITS, including
identifying the Serialization Model and creating Serialization Models.

3.2.1.1

Identifying the Seriali
z
ation Model


3.2.1.1.1

Static Model reference to Seriali
z
ation Model

Each s
tatic model will be associated with a single
S
eriali
z
ation
M
odel. This will
either be done with an annotation in the model (details to be provided), or can be
inferred from
its parent
static model.

3.2.1.1.2

Instance references to Seriali
z
ation Model


In the instan
ce
,

the
S
eriali
z
ation
M
odel and version will need to be declared using
new attributes.


The instance may also include references to the Standard Validation Models
to which
the sender is asserting conformance,
as well as any
locally defined Templates. The
rules for when and how such references are to be included
will
be clarified

in the V3
Templates specification
. It may be that the references are inferred from the
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implementation
contract agreement and need not be made explicit

in every message
instance
.

3.2.1.2

Creation of
S
eriali
z
ation
M
odels

The
S
eriali
z
ation
M
odel is created dir
ectly from
an appropriate
RIM based model. A
set of annotations as described in
S
ection
3.2.2
may be added to the model to indicate
which classes and attributes are not to be directly

included in seriali
z
ation

instances
.
These annotations are included in the “notes” field as structured text, and so are
visible in the human readable specifications and in the machine
-
readable
HL7
MIF

(Model Interchange Format)

documents.


When not modif
ied by the annotations, t
he seriali
z
ation of the structures foll
o
ws the
XML ITS
R1 s
tructures rules with the following differences:



Choice structures are represented in the seriali
z
ation model (and hence
the instance) as an XML element (naming convention t
o be confirmed)



CMET boundaries are represented using an XML element (naming
convention to be confirmed)



Possibly the inclusion of additional attributes to identify the Standard
Validation Model (alternatively these are treated in the same way as
HL7 Templ
ates, and referenced in the templateId attribute)



Additional attributes at the model entry point to identify the
serialization

model, and to provide version information for it.


For transport and control act wrapper content, the
serialization

may be define
d by the
transport protocol. While the ITS allows for this, it leaves defining such transport
specific
serialization
s to the
HL7 V3 T
ransport
Profile documentation.

3.2.2

Serialization
Model Annotation Rules

A set of annotations to RMIMs are proposed that descr
ibe some serialization rules.
These are added in the form of textual RMIM “notes”, that are saved into the MIF and
can be interpreted by tools that come later in the message production process.

(Ideally these serialization hints would be made in a fully gr
aphical style, but this isn’t
achievable yet.)


Serialization rules available are


Suppress a clone, RIM attribute or datatype attribute


Rename a clone, RIM attribute or datatype attribute


Collapse a clone into its parent


These operations can be local t
o the annotated clone, or can apply globally to the
whole model.


An example annotation is :

On a clone called ClinicalDocument:

ITS:global.codeSystem.suppress;global.contextConductionInd=ccInd;ClinicalDocum
ent=DischargeMessage


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On a clone called recordT
arget:

ITS:recordTarget.collapse


The “ITS:” prefix indicates that this is special purpose comment. Semi
-
colons are
used to separate multiple operations. The keywords “suppress” and “collapse”
correspond to a request for that action on the attribute that c
omes before the dot eg
recordTarget.collapse.


See Appendix C (
Error! Reference source not found.
) for more details on
annotations.

3.3

Model
-
based validation

One implication of establishing Serialization Models
is that

message
-
level models
(like specific document models) become constraint patterns for semantic validation
(rather than the direct basis for serialization).


This means that message and document instances will need to identify the appropriate
constraint patt
ern for validation purposes. The exact mechanism for achieving this
should be found within the V3 Templates specification.


To summarize, Refined Message Information Models (RMIMs)
and message types
become
S
tandard
V
alidation
P
atterns useful for applicati
on
-
level conformance
assertions. HL7 Templates remain local validation patterns that set conformance rules
according to local business requirements.

Note that
the only difference between an
HL7 Template and a Standard Validation Pattern is the fact that
the latter is approved
by HL7 ballot
.


3.4

Providing alternative
views

of RIM
-
Based Models

3.4.1

UML views of RIM
-
based Models

One feature of this ITS is to use UML (Unified Modelling Language) as a principle
design mechanism. Creating an implementation of V3 mode
ls that is based on
accepted industry implementation practices should help ease some of the skills pool /
learning curve challenges related to V3 implementation. Also, using UML allows for
detailed practical mapping to other standards such as CEN, ISO and

DICOM (e.g. at
the level of data types or message specifications).


A prototype tool has been developed to translate a MIF file into XMI. Figure 1 shows
a small part of a UML representation of a local RIM
-
based message model, as
outputted from the prot
otype tool and viewed with a commercial UML
-
based tool.


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Figure 1
: Detail from a UML representation of a local V3 Template / RMIM (NHS
Care Event Report)

class Class Model
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UKCT_RM144054UK01
RiskToPatient
ClinicalStatementChoiceUKCTRM140900UK01
Diagnosis
UKCT_RM144046UK01
PersonalPreference
CareEventReport
Cl one
«RIM_ActRel ati onshi p»
ExcerptFrom
«Requi red»
+
contextConducti onInd: BL
+
i nversi onInd: BL
+
negati onInd: BL
+
seperatabl eInd: BL
+
templ ateId: II
«Mandatory»
+
typeCode: ActRel ati onshi pType = ActRel ati onshi p...
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = ActRel ati onshi pType.XCRPT or typeCode =
ActRel ati onshi pType.VRXCRPT
i nv "i nversi onInd mandatory": i nversi onInd.ocl IsDefi ned() and i nversi onInd.i sNotNul l
i nv "no updates on i nversi onInd": i nversi onInd.noUpdate
i nv "i nversi onInd fi xed val ue": i nversi onInd.val ue = fal se
i nv "contextConducti onInd mandatory": contextConducti onInd.ocl IsDefi ned() and
contextConducti onInd.i sNotNul l
i nv "no updates on contextConducti onInd": contextConducti onInd.noUpdate
i nv "contextConducti onInd fi xed val ue": contextConducti onInd.val ue = true
i nv "negati onInd mandatory": negati onInd.ocl IsDefi ned() and negati onInd.i sNotNul l
i nv "no updates on negati onInd": negati onInd.noUpdate
i nv "negati onInd fi xed val ue": negati onInd.val ue = fal se
i nv "seperatabl eInd mandatory": seperatabl eInd.ocl IsDefi ned() and seperatabl eInd.i sNotNul l
i nv "no updates on seperatabl eInd": seperatabl eInd.noUpdate
i nv "seperatabl eInd fi xed val ue": seperatabl eInd.val ue = fal se
i nv "templ ateId mandatory": templ ateId.ocl IsDefi ned() and templ ateId.i sNotNul l
i nv "no updates on templ ateId": templ ateId.noUpdate
i nv "templ ateId fi xed val ue": templ ateId.root = "CSAT_RM-NPfITUK10_excerptFrom" and
templ ateId.extensi on.ocl IsUndefi ned()
CareEvent
Cl one
«RIM_ActRel ati onshi p»
Component
«Requi red»
+
contextConducti onInd: BL
+
seperatabl eInd: BL
+
templ ateId: II
«Mandatory»
+
typeCode: ActRel ati onshi pType = ActRel ati onshi p...
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = ActRel ati onshi pType.COMP or typeCode = ActRel ati onshi pType.ARR or typeCode =
ActRel ati onshi pType.DEP or typeCode = ActRel ati onshi pType.CTRLV

i nv "contextConducti onInd mandatory": contextConducti onInd.ocl IsDefi ned() and contextConducti onInd.i sNotNul l
i nv "no updates on contextConducti onInd": contextConducti onInd.noUpdate
i nv "contextConducti onInd fi xed val ue": contextConducti onInd.val ue = true
i nv "seperatabl eInd mandatory": seperatabl eInd.ocl IsDefi ned() and seperatabl eInd.i sNotNul l
i nv "no updates on seperatabl eInd": seperatabl eInd.noUpdate
i nv "seperatabl eInd fi xed val ue": seperatabl eInd.val ue = fal se
i nv "templ ateId mandatory": templ ateId.ocl IsDefi ned() and templ ateId.i sNotNul l
i nv "no updates on templ ateId": templ ateId.noUpdate
i nv "templ ateId fi xed val ue": templ ateId.root = "CSAB_RM-NPfITUK10_component" and templ ateId.extensi on.ocl IsUndefi ned()
Cl one
«RIM_Act»
CREType
«Mandatory»
+
cl assCode: ActCl ass = ActCl ass.CATEGORY
+
moodCode: ActMood = ActMood.EVN
«Requi red»
+
code: CV
i nv "cl assCode mandatory": cl assCode.ocl IsDefi ned()
i nv "no updates on cl assCode": cl assCode.noUpdate
i nv "cl assCode fi xed code": cl assCode = ActCl ass.CATEGORY
i nv "moodCode mandatory": moodCode.ocl IsDefi ned()
i nv "no updates on moodCode": moodCode.noUpdate
i nv "moodCode fi xed code": moodCode = ActMood.EVN
i nv "code mandatory": code.ocl IsDefi ned() and code.i sNotNul l
i nv "no updates on code": code.noUpdate
Cl one
«RIM_ActRel ati onshi p»
PertinentInformation2
«Requi red»
+
contextConducti onInd: BL
+
i nversi onInd: BL
+
negati onInd: BL
+
seperatabl eInd: BL
+
templ ateId: II
«Mandatory»
+
typeCode: ActRel ati onshi pType = ActRel ati onshi p...
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = ActRel ati onshi pType.PERT or typeCode = ActRel ati onshi pType.SPRT or typeCode = ActRel ati onshi pType.SPRTBND
or typeCode = ActRel ati onshi pType.SAS or typeCode = ActRel ati onshi pType.CHRG or typeCode = ActRel ati onshi pType.COST
or typeCode = ActRel ati onshi pType.CREDIT or typeCode = ActRel ati onshi pType.DEBIT
or typeCode = ActRel ati onshi pType.ITEMSLOC or typeCode = ActRel ati onshi pType.NAME
or typeCode = ActRel ati onshi pType.AUTH or typeCode = ActRel ati onshi pType.COVBY or typeCode = ActRel ati onshi pType.EXPL
or typeCode = ActRel ati onshi pType.PREV or typeCode = ActRel ati onshi pType.REFV or typeCode = ActRel ati onshi pType.SUBJ
or typeCode = ActRel ati onshi pType.DRIV or typeCode = ActRel ati onshi pType.CAUS or typeCode = ActRel ati onshi pType.MFST
or typeCode = ActRel ati onshi pType.LIMIT or typeCode = ActRel ati onshi pType.REFR or typeCode = ActRel ati onshi pType.SUMM

i nv "i nversi onInd mandatory": i nversi onInd.ocl IsDefi ned() and i nversi onInd.i sNotNul l
i nv "no updates on i nversi onInd": i nversi onInd.noUpdate
i nv "i nversi onInd fi xed val ue": i nversi onInd.val ue = fal se
i nv "contextConducti onInd mandatory": contextConducti onInd.ocl IsDefi ned() and contextConducti onInd.i sNotNul l
i nv "no updates on contextConducti onInd": contextConducti onInd.noUpdate
i nv "contextConducti onInd fi xed val ue": contextConducti onInd.val ue = true
i nv "negati onInd mandatory": negati onInd.ocl IsDefi ned() and negati onInd.i sNotNul l
i nv "no updates on negati onInd": negati onInd.noUpdate
i nv "negati onInd fi xed val ue": negati onInd.val ue = fal se
i nv "seperatabl eInd mandatory": seperatabl eInd.ocl IsDefi ned() and seperatabl eInd.i sNotNul l
i nv "no updates on seperatabl eInd": seperatabl eInd.noUpdate
i nv "seperatabl eInd fi xed val ue": seperatabl eInd.val ue = true
i nv "templ ateId mandatory": templ ateId.ocl IsDefi ned() and templ ateId.i sNotNul l
i nv "no updates on templ ateId": templ ateId.noUpdate
i nv "templ ateId fi xed val ue": templ ateId.root = "CSAB_RM-NPfITUK10_perti nentInformati on1" and templ ateId.extensi on.ocl IsUndefi ned()
Cl one
«RIM_Act»
RootCREType
«Mandatory»
+
cl assCode: ActCl ass = ActCl ass.CATEGORY
+
moodCode: ActMood = ActMood.EVN
«Requi red»
+
code: CV
i nv "cl assCode mandatory": cl assCode.ocl IsDefi ned()
i nv "no updates on cl assCode": cl assCode.noUpdate
i nv "cl assCode fi xed code": cl assCode = ActCl ass.CATEGORY
i nv "moodCode mandatory": moodCode.ocl IsDefi ned()
i nv "no updates on moodCode": moodCode.noUpdate
i nv "moodCode fi xed code": moodCode = ActMood.EVN
i nv "code mandatory": code.ocl IsDefi ned() and code.i sNotNul l
i nv "no updates on code": code.noUpdate
i nv "code fi xed val ue": code.code = "163171000000105" -- TODO: make thi s CTS aware?
Cl one
«RIM_ActRel ati onshi p»
PertinentInformation1
«Requi red»
+
contextConducti onInd: BL
+
i nversi onInd: BL
+
negati onInd: BL
+
seperatabl eInd: BL
+
templ ateId: II
«Mandatory»
+
typeCode: ActRel ati onshi pType = ActRel ati onshi p...
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = ActRel ati onshi pType.PERT or typeCode = ActRel ati onshi pType.SPRT or typeCode = ActRel ati onshi pType.SPRTBND
or typeCode = ActRel ati onshi pType.SAS or typeCode = ActRel ati onshi pType.CHRG or typeCode = ActRel ati onshi pType.COST
or typeCode = ActRel ati onshi pType.CREDIT or typeCode = ActRel ati onshi pType.DEBIT
or typeCode = ActRel ati onshi pType.ITEMSLOC or typeCode = ActRel ati onshi pType.NAME
or typeCode = ActRel ati onshi pType.AUTH or typeCode = ActRel ati onshi pType.COVBY or typeCode = ActRel ati onshi pType.EXPL
or typeCode = ActRel ati onshi pType.PREV or typeCode = ActRel ati onshi pType.REFV or typeCode = ActRel ati onshi pType.SUBJ
or typeCode = ActRel ati onshi pType.DRIV or typeCode = ActRel ati onshi pType.CAUS or typeCode = ActRel ati onshi pType.MFST
or typeCode = ActRel ati onshi pType.LIMIT or typeCode = ActRel ati onshi pType.REFR or typeCode = ActRel ati onshi pType.SUMM

i nv "i nversi onInd mandatory": i nversi onInd.ocl IsDefi ned() and i nversi onInd.i sNotNul l
i nv "no updates on i nversi onInd": i nversi onInd.noUpdate
i nv "i nversi onInd fi xed val ue": i nversi onInd.val ue = fal se
i nv "contextConducti onInd mandatory": contextConducti onInd.ocl IsDefi ned() and contextConducti onInd.i sNotNul l
i nv "no updates on contextConducti onInd": contextConducti onInd.noUpdate
i nv "contextConducti onInd fi xed val ue": contextConducti onInd.val ue = true
i nv "negati onInd mandatory": negati onInd.ocl IsDefi ned() and negati onInd.i sNotNul l
i nv "no updates on negati onInd": negati onInd.noUpdate
i nv "negati onInd fi xed val ue": negati onInd.val ue = fal se
i nv "seperatabl eInd mandatory": seperatabl eInd.ocl IsDefi ned() and seperatabl eInd.i sNotNul l
i nv "no updates on seperatabl eInd": seperatabl eInd.noUpdate
i nv "seperatabl eInd fi xed val ue": seperatabl eInd.val ue = true
i nv "templ ateId mandatory": templ ateId.ocl IsDefi ned() and templ ateId.i sNotNul l
i nv "no updates on templ ateId": templ ateId.noUpdate
i nv "templ ateId fi xed val ue": templ ateId.root = "CSAB_RM-NPfITUK10_perti nentInformati on1" and templ ateId.extensi on.ocl IsUndefi ned()
Cl one
«RIM_Act»
MessageRef
«Mandatory»
+
cl assCode: ActCl ass = ActCl ass.COMPOSITION
+
moodCode: ActMood = ActMood.EVN
«Requi red»
+
i d: II
i nv "cl assCode mandatory": cl assCode.ocl IsDefi ned()
i nv "no updates on cl assCode": cl assCode.noUpdate
i nv "cl assCode fi xed code": cl assCode = ActCl ass.COMPOSITION or cl assCode = ActCl ass.DOC or cl assCode =
ActCl ass.DOCCLIN or cl assCode = ActCl ass.CDALVLONE

i nv "moodCode mandatory": moodCode.ocl IsDefi ned()
i nv "no updates on moodCode": moodCode.noUpdate
i nv "moodCode fi xed code": moodCode = ActMood.EVN
i nv "i d mandatory": i d.ocl IsDefi ned() and i d.i sNotNul l
i nv "no updates on i d": i d.noUpdate
Cl one
«RIM_ActRel ati onshi p»
ReplacementOf
«Mandatory»
+
typeCode: ActRel ati onshi pType = ActRel ati onshi p...
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = ActRel ati onshi pType.RPLC or typeCode = ActRel ati onshi pType.SUCC
Cl one
«RIM_Parti ci pati on»
Author2
«Mandatory»
+
contextControl Code: ContextControl = ContextControl.OP
+
typeCode: Parti ci pati onType = Parti ci pati onTy...
«Requi red»
+
ti me: TS
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = Parti ci pati onType.AUT
i nv "contextControl Code mandatory": contextControl Code.ocl IsDefi ned()
i nv "no updates on contextControl Code": contextControl Code.noUpdate
i nv "contextControl Code fi xed code": contextControl Code = ContextControl.OP
i nv "ti me requi red": ti me.ocl IsDefi ned()
i nv "no updates on ti me": ti me.noUpdate
Cl one
«RIM_Rol e»
Patient
«Mandatory»
+
cl assCode: Rol eCl ass = Rol eCl ass.PAT
«Requi red»
+
i d: II
i nv "cl assCode mandatory": cl assCode.ocl IsDefi ned()
i nv "no updates on cl assCode": cl assCode.noUpdate
i nv "cl assCode fi xed code": cl assCode = Rol eCl ass.PAT
i nv "i d mandatory": i d.ocl IsDefi ned() and i d.i sNotNul l
i nv "no updates on i d": i d.noUpdate
Cl one
«RIM_Parti ci pati on»
RecordTarget
«Mandatory»
+
typeCode: Parti ci pati onType = Parti ci pati onTy...
i nv "typeCode mandatory": typeCode.ocl IsDefi ned()
i nv "no updates on typeCode": typeCode.noUpdate
i nv "typeCode fi xed code": typeCode = Parti ci pati onType.RCT
Cl one
«RIM_Act»
GPSummary
«Mandatory»
+
cl assCode: ActCl ass = ActCl ass.COMPOSITION
+
moodCode: ActMood = ActMood.EVN
«Requi red»
+
code: CV
+
effecti veTi me: TS
+
i d: II
+
statusCode: CS
i nv "cl assCode mandatory": cl assCode.ocl IsDefi ned()
i nv "no updates on cl assCode": cl assCode.noUpdate
i nv "cl assCode fi xed code": cl assCode = ActCl ass.COMPOSITION or cl assCode = ActCl ass.DOC or cl assCode =
ActCl ass.DOCCLIN or cl assCode = ActCl ass.CDALVLONE

i nv "moodCode mandatory": moodCode.ocl IsDefi ned()
i nv "no updates on moodCode": moodCode.noUpdate
i nv "moodCode fi xed code": moodCode = ActMood.EVN
i nv "i d mandatory": i d.ocl IsDefi ned() and i d.i sNotNul l
i nv "no updates on i d": i d.noUpdate
i nv "code mandatory": code.ocl IsDefi ned() and code.i sNotNul l
i nv "no updates on code": code.noUpdate
i nv "code fi xed val ue": code.code = "196981000000101" -- TODO: make thi s CTS aware?
i nv "effecti veTi me mandatory": effecti veTi me.ocl IsDefi ned() and effecti veTi me.i sNotNul l
i nv "no updates on effecti veTi me": effecti veTi me.noUpdate
i nv "statusCode mandatory": statusCode.ocl IsDefi ned() and statusCode.i sNotNul l
i nv "no updates on statusCode": statusCode.noUpdate
i nv "statusCode fi xed val ue": statusCode.code = "acti ve" -- TODO: make thi s CTS aware?
UKCT_RM144056UK01
Refusal
RisksAndWarning
RiskToPerson
AllergyDE
Allergy
UKCTRM120000UK01
AgentPerson
AgentPersonSDS
UKCT_RM144039UK02
ProblemLinkAssertion
ProblemMemberAssertion
LinkAssertion
UKCTRM144051UK01Presentationtext
CareProfessionalDocumentationCRE
UKCT_RM144038UK02
Problem
UKCT_RM144050UK01
AdministrativeProcedure
UKCTRM144040UK01MedicationRecordMinimal
MedicationAdministration
DiscontinuedRepeatMedication
AcuteMedication
CurrentRepeatMedication
UKCT_RM144043UK02
FindingOrganizer
Temperature
Height
Weight
BloodPressure
Finding
CMETRelevantHistory
SocialOrPersonalCircumstance
AlcoholIntake
Smoking
LifeStyle
FamilyHistory
Investigation
Service
ProvisionOfAdviceAndInformation
Treatment
v3Base
UCKTRM144035UK01DocAndCorrespondence
PatientCarerCorrespondence
ThirdPartyCorrespondence
CareProfessionalDocumentation
+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
«access»
«access»
«access»
«access»
«i mport»
«access»
«access»
+cMETChoi ce
cMETChoi ce
+contai ner
«access»
+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
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cMETChoi ce
+contai ner
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cMETChoi ce
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+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+sourcePresentati onText
sourcePresentati onText
+contai ner
«access»
+cMETChoi ce
cMETChoi ce
+contai ner
«access»
«access»
«access»
«access»
«access»
«access»
+rol e
rol e
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cMETChoi ce
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cMETChoi ce
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cMETChoi ce
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cMETChoi ce
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+cMETChoi ce
cMETChoi ce
+contai ner
+component
component
+contai ner
+perti nentCREType
perti nentCREType
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+pri orMessageRef
pri orMessageRef
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+rol e
rol e
+contai ner
+pati ent
pati ent
+contai ner
+excerptFrom
excerptFrom
+contai ner
+perti nentInformati on2
perti nentInformati on2
+contai ner
+perti nentInformati on1
perti nentInformati on1
+contai ner
+repl acementOf
repl acementOf
+contai ner
+author
author
+contai ner
+perti nentRootCREType
perti nentRootCREType
+contai ner
+cMETChoi ce
cMETChoi ce
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cMETChoi ce
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cMETChoi ce
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+cMETChoi ce
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+cMETChoi ce
cMETChoi ce
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+cMETChoi ce
cMETChoi ce
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+cMETChoi ce
cMETChoi ce
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+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+recordTarget
recordTarget
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
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cMETChoi ce
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cMETChoi ce
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cMETChoi ce
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+cMETChoi ce
cMETChoi ce
+contai ner
+cMETChoi ce
cMETChoi ce
+contai ner


3.4.2

Simplified views

This ITS allows implementers the option of carrying

out a sequence
of steps

to re
strict
and change the shape of a
n

HL7 R
IM
-
Based Model (e.g. R
MIM
)

to suit various local
business purposes
. These
optional
steps
may be taken with the intention of making

the model easier for d
omain experts to understand, or

easier to map onto healthcare I
T
systems.

Often, it may be desirable to provide a view
of a message model
that
‘mimics’ the domain analysis model as much as possible, in order to demonstrate the
mapping
or ‘traceability’
between requirements and message design models.


Alternative view
s

may also
make XML message instances based on the reshaped
model smaller and easier to read

than instances of the full
HL7
XML ITS
. Such
serialization
s,

however, would not be conformant to the V3 Standard
.

The use of
‘simplified’ XML message instances m
ay only be done at the users’

risk (and

may
only
be appropriate
by agreement within

small and isolated communications scenarios
which are not likely to be extended in scope in future).



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Alternatively these instances can be used as a step
towards implement
ing

the standard
ITS.

A supplier
-
specific simplified model can be produced and
may be
target
ted

more easily by that supplier’s data source.

An automatic transform is then available
to convert th
ese instances

to the more complex standard ITS

as needed
.


A
ny simplification steps taken to provide an alternative view of a RIM
-
Based Model
shall be recorded as mappings

between the original
model
and
its simplified view
.



A prototype
RIM
-
Based Model ‘reshaper’
tool is available that produces

the
following outp
uts:


1.

The mappings between
the RIM
-
Based Model and its simplified alternative
, in
a table
-
like XML form (which can be read back into the tool to do further
reshaping)

2.

A
n HL7 Model Interchange Format (MIF)
file defining the
reshaped
structure

3.

An ex
a
mpl
e

XML

message using the full HL7
XML ITS

R1
,
with
instance
values input by the user

4.

An exemplar XML message in the
simplified

XML, using the same instance
values


The two exemplar XML files,
simplified
and

‘original’
, are semantically equivalent to
one another.


This may be

demonstrate
d

by automatically translating

from full
(RIM
-
Based)
XML ITS to
simplified
XML, and vice versa.


T
he reshaping tool, being an experimental tool built for the purposes of evaluating a
range of proposals for the new ITS, has some cap
abilities which we now do not think
are appropriate or necessary for the new ITS.
T
hese capabilities may be relevant for
other purposes


notably for producing local reshaped messages as an intermediate
XML along the way to XML which is conformant, either
to the previous
ITS
or the
new XML ITS.


One of these capabilities is the capability to

restrict a model


a step which might
normally be done in other stages of modelling, but which can also be done in the
reshaping too
l
.
T
he following options may be take
n when
restricting a

R
IM
-
Based
Model
:



Restrict the minimum and maximum cardinality of any property or association
to a smaller subset of the line [0..1..*] (e.g [min..max] = [0..1] can be
restricted to [0..0] or [1..1] )



Constrain any leaf property (= RMI
M structural attribute, or leaf property
within a V3 data type) to a fixed value


T
he following options may be taken when simplifying a

R
IM
-
Based Model
:



Collapse any association with maximum cardinality = 1, so that the two
classes at either end of the ass
ociation become the same class



Rename any class, property or association



Remove any property with a fixed value

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Remove
any property or association with minimum cardinality 0 (this is
equivalent to restricting its cardinality to [0..0] )


(
The collapse of
a
ny association with maximum cardinality = * (unlimited)
is
not
an
option
because single
-
valued properties of the inner merged class would become
multiple
-
valued properties of the merged class.
)


The reshaping operations can be done either on parts of the R
MIM proper (i.e. on
classes described in the RMIM MIF file), or on classes which represent the structure
of the V3 data types (taken from the data type schema).

These are called ‘data type
classes’.

3.4.3

Representing simplified d
ata
t
ype
c
lasses

Another capa
bility of the reshaping tool, which goes beyond the capabilities needed
for the new ITS, is the ability to restrict and reshape within V3 data types
,

and more
generally
to reshape
across model boundaries.


For the purposes of the new ITS, we would not exp
ect general restriction or reshaping
within data types; we would expect to see a standard set of mappings between the data
types of the previous ITS and
those
of the new ITS (as far as that is possible)
supported by two
-
way translation capability provided,

for instance in XSLT. For local
resh
aping purposes (i.e
.

simplified messages which do
not go on the wire)
more
general restriction and reshaping within data types
may be

useful.


3.4.4

Semantic
e
f
fe
cts of
s
i
mplifying

If only the reshaping steps allowed
as above

are done, then the
simplified or
alternative model
should be semantically equivalent to
a restricted
R
IM
-
based model
,
in the following sense:



Any valid
simplified model
instance can be automatically translated to an
instance of the restricted R
IM
-
based mo
del
(which is also an instance of the
full R
IM
-
based model
)



Any valid instance of the restricted R
IM
-
based model

can be automatically
translated into and instance of the

simplified alternative
.


The reshaping tool allows collapsing of associations with ca
rdinality [0..1]. This
introduces
some subtle
semantic issues which we may wish to keep out of any new
ITS definition of messages on the wire.
If, during the reshaping, any associations with
cardinality [0..1] have been
collapsed
, then:



In some cases, tra
nslation of a DAM instance to an RMIM instance may be
indeterminate, in that the RMIM instance may or may not contain an instance
of some class (which has no property values or further associations, so does
not carry any property value information)



Valid D
AM instances must obey some constraints between the cardinality of
different properties in different parts of the DAM tree.

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4

Glossary

Standard
Serialization

Model

Standard Validation Model



5

Outstanding Issues




Is the name of the XML element representing a
choice taken from the
name of the choice, or from the association role name?



Are names for entry points into CMETs generated from both the
association and the root class name as is is the case in the current ITS?



What mechanism for informal extensions is t
o be followed


that used
by Gunther in SPL, that specifed in the XML IST R1, or both



Are the identifiers for the Standard Validation Model conveyed in the
templateId, or in a different attribute.



Are Standard validation Models referenced everywhere in the

instance,
just at model entry points, or are they inferred from the interactionId?



Which of the datatypes changes proposed on the HL7 Wiki have been
implemented in the R2 datatypes proposal that is associated with this
document?



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Appendi
ces

A.

Support
ing HL7 member organizations

(at least 5 willing to implement within a ‘reasonable timeframe’


The following organizations are willing (as at <date>) to implement this ITS, either as
early (pre
-
standard) adopters or standard adopters:

B.

Tooling

(beta tool
s must be presented along with the proposal)



[LS: assume this is for final
standard vote

and not necessarily for first DSTU
?]

B.1

The RMIM Reshaper
Tool


This appendix describes:




What the reshaping tool does



T
ests
made

with it during the course of thi
s investigation



How the tool relates to the proposed new ITS



Other uses of the tool



Its current and expected future status.



What the Reshaping Tool Does


The reshaping tool is a standalone Java program whose main input is a MIF file
defining a RIM
-
based
model, typically an RMIM for a message.

Supporting CMET

MIF
s and a data type schema are also required as inputs.


Under user control,
the tool

can then do any of the restricting and reshaping
operations described
in the paper
above. Restriction operations
include restricting the
cardinalities of attributes and associations. Reshaping operations

include:



Renaming classes, attributes or associations



‘unmapping’

attributes or association
s so they do not appear in the reshaped
model



Collapsing associations of
cardinality 0..1 or 1..1, so the classes at either end
of the association merge (and
automatically
renaming attributes and
associations to avoid
any
clashes)


Throughout these operations
the tool

gives the user a tabular view of the reshaped
model, one tab
le per class.

This display is shown below.



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Most reshaping operations are local, on
a

selected attribute or association, but there
are a few global
reshaping
operations which operate across the whole model.


Throughout these operations, the tool keep
s track of a set of mappings between the
original RIM
-
based model and the reshaped model
. These mappings can be exported
from the tool in a simple XML
-
based form, and re
-
imported into the tool for further
reshaping.


It is also possible in the tool to ente
r and store instance values for any leaf attribute of
the model. These values can be used to output example messages both in the original
RBM form and i
n reshaped form, to compare the two for size, readability, and so on
.


The following outputs are direct
ly available from the tool:



Mappings between the original and the reshaped model



Example messages in original and reshaped XML



A MIF definition of the reshaped model



Mappings in a form suitable for use by other translation tools.


It is intended to make th
e following outputs directly available from the tool

in t
he near
future:



An XMI definition of the reshaped model



XML schema for the reshaped model


The following outputs are available from other tools which will be made available in
association with the re
shaping tool, either as executables or as a free web service:

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XML schema for the reshaped model



XSLT translations between the or
i
ginal and resh
a
ped models, in both
directions


Experiments Done with the Reshaping Tool


Although small tests have been made wi
th other messages, the main experiment that
has been done is one of unconstrained reshaping of the pharmacy

ParentPrescription
message, requiring
only
that the reshaped message should be capable of conveying al
l

the information in
two

‘greenfields’
messag
e
examples which
embody the basic
capability of typical pharmacy systems.


The reshaping was unconstrained in that:



Restriction and reshaping was allowed inside V3 data types; for instance, it
was

allowed to collapse data type classes

into their parent RM
IM classes, or to
reshape the same V3 data type differently in different occurrences



Reshaping was allowed across model boundaries, for instance across CMET
boundaries.



It was allowed to collapse associations with cardinality 0..1
, as well as 1..1
associa
tions




Attributes could be

unmapped on the basis that they

were known constants for
the applications involved, rather than within the message definition.


Using the unconstrained reshaping, it was possible to greatly decrease the complexity
of the message
definition, making it into much shallower XML (
nesting
depth about
5, which could have been reduced further), with many fewer distinct nodes (the
number of distinct XPaths to leaf nodes was reduced by a factor of about 20).
Renaming was used to make the na
mes of associations and attributes closer to
obvious domain names.


This gave a message definition which was not V3 conformant,
but which was
easier

to map onto and to translate to and from application representations. The XML was
suitable as a local ‘int
ermediate XML’ between an application and V3, as
recommended by HL7
.org

on the Implementation WIKI. In this case, however, the
further translation between the intermediate XML and
conformant
V3 could be done
automatically and accurately

by
generated
XSLT
,
as described below.


Because the reshaping was unre
stricted, it was not the

sort of
reshaping that one
would expect TCs to make when defining message definitions in the new ITS.

M
ore
limited reshaping would be expected in this case.


Instan
ces of the resha
ped XML turned out to be about 30% of the size of
the
instances
of
the full XML ITS

with the same data
,
including the

fixed attributes (
e.g.

RIM
structural attributes).


Using the reshaping mappings in other tools, XSLT was generated to translate
between t
he reshaped and original XML forms in either direction. This XSLT worked
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accurately in both directions. The time taken to translate using Saxon 8 on a medium
-
spec laptop was about 300 ms for a 6 Kbyte message instance.


An exper
iment was done, using

other
tools, of mapping

a flat quasi
-
relational XML
(of the kind that is can be extracted from relational databases by several tools) onto
the reshaped model, and using these mappings to generate translations between the
‘relational’ XML and both the reshaped an
d full message definitions. These
translations ran
accurately
.


We are currently extending the reshaping tool to be driven by annotations in a MIF
file, of the form described below, rather than
interactively
by user commands.


Relation of the RMIM Reshapin
g Tool to
the N
ew ITS


We expect that if HL7 technical committees and SIGs make new ITS definitions
within their domains, these definitions will be related t
o current ITS definitions as
follow
s:



At the level of DIM
classes, the new definitions will be rela
ted to current ITS
definitions by reshaping operations that are supported by the reshaping tool
.
These may include renaming, unmapping of fixed attributes, and collapsing
associations ; but respecting model boundaries



At the level of data type
s
, the new de
finitions will
uniformly
use the new data
types.

Inasmuch as there is semantic equivalence

between the
new and old V3
data types

(i.e. in the great majority of cases)
, it will be possible to provide
standard

XSLT
templates

to translate be
tween the two, for

use in message
translations

between the two ITS


The re
s
haping tool can therefore be used to capture the reshaping mappings, driven by
model annotations defined by TCs

or SIGs
. Outputs from the tool can be used to
generate automatic and accurate

XSLT

tra
nslations in both directions between the
two ITS.


These XSLT translations
could

therefore support full interoperability between new
and old ITS, allowing
systems using new and old ITS to communicate with one
another, and so allowing
implementors and suppl
iers

to transition betwee
n the two
ITS in an incremental manner at a time which suits them, rather than requiring any
‘big bang’ cutover.


We expect that the reshaping operations used by TCs at the DIM level will not be as
radical as those used in our exp
eriments


because the TCs have b
uilt these models to
support a wide range of use cases, and they must continue to do so. Therefore the size
and shape of new ITS models may differ from the current models, but not radically.



Certain associations involvin
g Participations and ActRelationships can always be
collapsed.

RIM structural attributes can be unmapped and so removed

if wanted.
Therefore models can be flattened

to some extent
, but the number of attr
ibutes will
not be not reduced by a great deal.

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Othe
r
Uses of the Reshaping Tool


While TCs may not
want

to reshape their models radically in the new ITS, individual
applications or groups of applications may have more restricted needs, and so more
radical reshaping may be appropriate

for them


for instanc
e, restricting before
reshaping, reshaping data types, and reshaping across model boundaries
.
Unconstrained reshaping can give much simpler models, which are easier to map onto
applications or other standards.

With constrained reshaping, there is greater f
reedom
to make a message model resemble a domain analysis model.


The main use case we envisage is to use the reshaping tool to generate simpler
intermediate XMLs to map onto,
then
using the XSLT translation capability to
translate to and from full

V3 (
whe
ther of the new or the proposed new ITS
)
.

This is
how HL7 currently recommends applications should be interfaced to V3.


As an example, the V2
-
V3 mapping tool currently maps V2 messages direct onto a
V3 RMIM, and there are related facilities to do V2
-
V3 tr
anslations from the
mappings. It would be possible, using the reshaping tool, to define restricted and
reshaped versions of the V3 messages, which
are

closer to the capability of V2 and
thus simpler, and then to map V2 onto the reshaped definition
s
. This m
apping would
be simpler than a mapping direct onto V3; but by using the XSLT ‘step
-
up’
transformation from reshaped to full V3, V2
-
V3 translation could still be achieved.
All the tools exist now to do this, but it has not yet been tried.


While
the reshape
d XML

would mainly be used locally as a means of reading and
writing V3, and so
would
not go on the wire, it would nevertheless open to groups of
consenting parties to use the reshaped XML over the wire


mainly in cases where
message size is important.
Th
e
se parties would still be able to provide conformant V3
to any other parti
es who required it, by using the XSLT translations.


Current and Future
Status

of the Reshaping Tool


The reshaping tool is currently in prototype form,

having been developed for th
e

experiments

in connection with the new ITS
. It is a standalone Java tool, and is not
yet in the Eclipse framework. Nevertheless, it appears to be ro
bust
, so it will shortly
be put on the HL7 tooling

Homebase for other
s

to try out.

Some obvious
enhanceme
nts are required , such as a better undo facility.
At some stage it may be put
on the Eclipse framework, but there are not yet definite plans to do so. It will remain
free
ly available

and will become open source if there is demand.


Generation of XSLT to t
ranslate between standard and reshaped messages is not a
capability of the reshaping tool, but is done by
other

tools from Charteris plc, using
mapping files output from the reshaper. It is Charteris’ intention to set up a web
service to provide these XSLT

translations from the mappings. This web service will
initially be a free beta test service, and then will be provided on reasonable
commercial terms. It will always be available free to HL7 members for approved HL7
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purposes


for instance, for use by TCs

and SIGs to generate XSLT translations for
standard reshapings.


Other related mapping tools, such as the tool used to make mappings to relational
-
style XML described above, will be made available on an open source basis

if there is
demand
.



C.

Model
Ann
otation Syntax

This section advances a syntax for use as text comments on an R
IM
-
based

diagram.
These are inserted by the user and picked up, via the MIF, by the Reshaping tool.


The annotations permitted are




Suppress

attribute
.suppress

attribute.dataTyp
eAttribute
.suppress

eg code.
codeSystem.suppress

would remove the codeSystem datatype
attribute from the annotated clone’s code attribute. (“clone” being a diagram
element derived from the RIM)

.




Rename

attribute
=
name

clone
=
name


eg. recordTarget=patient




Collapse

clone
.collapse

eg
global.codeSystem.suppress


The keyword “global” can also be used as a prefix
, as in the example above, to make
the change happen all over the model.


A
BNF
for the annotations is
:


<rule> ::= "ITS:" <commandList>

<commandL
ist> ::= <command> | <command> ";" <commandList>

<command> ::= <identifier> "." <action> | <identifier> "=" <name>

<action> ::= "suppress" | "collapse"

<identifier> ::= "global" "."
<localIdentifier> | <localIdentifier>

<localIdentifier> ::= <RIMClone> |
<RIMAttribute>

<RIMAttribute> ::= <RIMAttributeName> | <RIMAttributeName> "."
<dataTypeAttribute>


Symbols undefined above :


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<name>



the new name for a renamed item

<RIMClone>

the “clone name” of an RMIM shape, cloned from the
RIM

<RIMAttributeName
>

the
name of a RIM attribute of a clone eg. id,
effectiveTime

<dataTypeAttribute>

the name of a datatype attribute eg. extension,
codeSystem


All white space is insignificant
.



Example annotations :




Note
: In creating this ITS markup language, user readab
ility was the primary aim.
Ideally a fully graphical interface and presentation would be used instead of a textual
one. This language was designed to suit the non technical user, hence the intuitive
syntax of "=" to give an alternate name, and the english
-
like ";" to split multiple
phrases. "Dot notation" eg patient.id is assumed to be widely enough recognised to be
suitable for use.