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https://issues.apache.org/jira/browse/XERCESC-1610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Boris Kolpackov closed XERCESC-1610.
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Resolution: Duplicate
Duplicate of XERCESC-1810
> Validator incorrectly rejects XML
> ---------------------------------
>
> Key: XERCESC-1610
> URL: https://issues.apache.org/jira/browse/XERCESC-1610
> Project: Xerces-C++
> Issue Type: Bug
> Components: Validating Parser (XML Schema)
> Affects Versions: 2.7.0
> Environment: Linux (Debian Etch)
> Reporter: Edsko de Vries
>
> Consider the following XML schema:
> <?xml version="1.0"?>
> <xs:schema
> xmlns:xs="http://www.w3.org/2001/XMLSchema";
> xmlns="http://testcase";
> targetNamespace="http://testcase";
> elementFormDefault="qualified">
> <xs:element name="root">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="a" type="xs:string"/>
> <xs:element name="a" type="xs:string" nillable="true"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
> </xs:schema>
> And the following XML test instance:<?xml version="1.0"?>
> <root xmlns="http://testcase";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://testcase schema.xsd">
> <a>a</a>
> <a xsi:nil="true" />
> </root>
> This yields the following (incorrect) error:
> Error at file test.xml, line 4, char 22
> Message: xsi:nil must not be specified for the element a with nillable
> equals false
> Interestingly, when the schema (and the instance document) is modified so
> that the two tags are reversed:
> ...
> <xs:element name="a" type="xs:string" nillable="true"/>
> <xs:element name="a" type="xs:string"/>
> ...
> the document _does_ validate fine. However, with this schema, when the
> instance document is modified to
> <?xml version="1.0"?>
> <root xmlns="http://testcase";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://testcase schema.xsd">
> <a xsi:nil="true" />
> <a xsi:nil="true" />
> </root>
> the document _still_ validates! (whereas of course it should no longer
> validate).
> Guess: It appears the nillability of <a> is stored the first time an <a> is
> encountered; so, when the first <a> is not nillable, Xerces thinks that all
> <a>s must not be nillable, but when the first <a> is nillable, it thinks all
> <a> may be nillable.
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