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https://issues.apache.org/jira/browse/XERCESJ-1427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Gao resolved XERCESJ-1427.
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Resolution: Fixed
Just committed support of the new content type restriction rules.
The implementation treat both the base content model and the derived as DFAs
and match corresponding states in the 2 content models. This is not very
efficient if the derived content model is an "all" model group. Some
optimization is included for all-all derivation, by attempting to simplify the
content models before falling back to the DFA approach.
> Check subsumption relationship of complex type particles
> ---------------------------------------------------------
>
> Key: XERCESJ-1427
> URL: https://issues.apache.org/jira/browse/XERCESJ-1427
> Project: Xerces2-J
> Issue Type: New Feature
> Components: XML Schema 1.1 Structures
> Affects Versions: 2.10.0
> Reporter: Michael Glavassevich
> Assignee: Sandy Gao
>
> In XML Schema 1.1 [1], the sequences of sub-elements allowed by a complex
> type is determined by its content model, a particle [2]. When one complex
> type restricts a base type, its particle is required to accept less [3] than
> that of the base type. When <all> model groups [4] are used in the
> restriction type (while the base type may also have an <all> group or have a
> combination of <sequence>s and <choice>s), the "accept less" requirement
> becomes an interesting task. The student is expected to study this problem,
> research existing solutions to similar issues (e.g. those listed here [5]),
> and propose and implement a solution. This work also helps to address the
> Priority Feedback [6] in the specification regarding the usefulness and
> implementation difficulty of this feature.
> Possible Mentors: Sandy Gao
> [1] http://www.w3.org/TR/xmlschema11-1/
> [2] http://www.w3.org/TR/xmlschema11-1/#cParticles
> [3] http://www.w3.org/TR/xmlschema11-1/#cos-content-act-restrict
> [4] http://www.w3.org/TR/xmlschema11-1/#Model_Groups
> [5] http://www.w3.org/TR/xmlschema11-1/#subsumptionCheckP
> [6] http://www.w3.org/TR/xmlschema11-1/#derivation-ok-restriction
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