[GSoC]: Implementing XML Schema 1.1 overriding component definitions
(<xs:override>)
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Key: XERCESJ-1433
URL: https://issues.apache.org/jira/browse/XERCESJ-1433
Project: Xerces2-J
Issue Type: New Feature
Components: XML Schema 1.1 Structures
Affects Versions: 2.9.1
Reporter: Michael Glavassevich
XML schema specification version 1.1 [1] specifies syntax and semantics of
"Overriding component definitions<override>"[2] or xs:override , under "Schemas
and Namespaces: Access and Composition" . The new component definition is a
powerful addition to the XML schema composition framework ,which tries to
mitigate some of the constraints present in similar constructs such as
xs:redefine or <redefine> schema component.
The <redefine> construct defined in "Including modified component definitions
(<redefine>) "[3] on XMLSchema specification is useful in schema evolution and
versioning. It can be used only when there exists some restriction or extension
relation between the old component and the new redefined component. But there
are occasions when the schema author simply wants to replace old components
with new ones without any constraint. Also, existing XSD processors have
implemented conflicting and non-interoperable interpretations of <redefine>.
The implementation of new construct <override> on Xerces XML Schema processor
,would avoid these bottlenecks and allow unconstrained replacement as and when
needed by the schema author.
Possible Mentors: Khaled Noaman
[1] http://www.w3.org/TR/2006/REC-xml11-20060816/
[2] http://www.w3.org/TR/xmlschema11-1/#override-schema
[3] http://www.w3.org/TR/xmlschema11-1/#modify-schema
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