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quirements coverage. It has also simplified the vali-
dation of pyramidical standards.
The implementation of this methodology was
done using open source tools, especially Topcased as
editor, DresdenOCL as OCL processor, and Acceleo
as M2T generator. The generated output code was
on Java technology. The result of this implementa-
tion has covered the needs of developers and users of
the generated validators. The use of this methodology
to create validators for multiple kinds of healthcare
standards in many domains like epSOS and IHE has
proved the efficiency of this method: any kind of con-
straint can be expressed. And also, an important fea-
ture was, the model based validators are quicker than
schematrons.
Several improvements could be injected into this
methodology and its implementation, like a self edi-
tor of the UML model, to simplify the creation and
the management of classes and constraints. Also, the
concept of stereotypes to describe classes and con-
straints can evolve to a meta-model that describes this
set of stereotypes, and a use of GMF can improve the
usability and minimize the risk of inconsistencies of
UML models. Moreover, the model based validation
of XML based healthcare standards could be adapted
to other domains that use the XML technology.
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