Errors using substitution groups in restrictions
------------------------------------------------
Key: XERCESJ-1306
URL: https://issues.apache.org/jira/browse/XERCESJ-1306
Project: Xerces2-J
Issue Type: Bug
Components: XML Schema Structures
Affects Versions: 2.9.1
Environment: Xerces-J 2.9.1 within Oxygen 9.0 in MacOSX
Reporter: Fabio Vitali
I am trying to go from abstract to concrete using substitution groups. So far I
have not managed, and I am wondering why:
Example:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
<xs:element name="heading" type="block" abstract="true" />
<xs:element name="number" substitutionGroup="heading"/>
<xs:element name="title" substitutionGroup="heading"/>
<xs:complexType name="block" mixed="true">
<xs:choice>
<xs:element name="b" type="block"/>
<xs:element name="i" type="block"/>
</xs:choice>
</xs:complexType>
<xs:element name="hcontainer" type="hierarchicalContainer" abstract="true"
/>
<xs:element name="section" substitutionGroup="hcontainer"/>
<xs:element name="chapter" substitutionGroup="hcontainer"/>
<xs:complexType name="hierarchicalContainer" abstract="true">
<xs:sequence>
<xs:element ref="heading" maxOccurs="unbounded"/>
<xs:element ref="hcontainer" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="bookType1">
<xs:complexContent>
<xs:restriction base="hierarchicalContainer">
<xs:sequence>
<xs:element ref="number"/>
<xs:element ref="chapter" maxOccurs="unbounded"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
</xs:schema>
--
Error
rcase-Recurse.2: There is not a complete functional mapping between the
particles.
URL: http://www.w3.org/TR/xmlschema-1/#rcase-Recurse
derivation-ok-restriction.5.4.2: Error for type 'bookType1'. The particle of
the type is not a valid restriction of the particle of the base.
URL: http://www.w3.org/TR/xmlschema-1/#derivation-ok-restriction
Comments
To my knowledge, BookType1 should work: number is substitutable for heading and
maxOccurs of the restriction is less than maxOccurs of the base, chapter is
substitutable for hcontainer, and maxOccurs of the restriction is equal to
maxOccurs of the base. So to my knowledge this should note pose problems. Yet...
Notes
Funny that if I only substitute the first name of the two elements, it suddenly
works. The following example is identical except that "chapter" has gone back
to the abstract element "hcontainer".
<xs:complexType name="bookType2">
<xs:complexContent>
<xs:restriction base="hierarchicalContainer">
<xs:sequence>
<xs:element ref="number" />
<xs:element ref="hcontainer" maxOccurs="unbounded"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
Even funnier i that if I remove the repeatability of the hcontainer it also
works. The following example is as the first one, except that I am forbidding
repeatability of element "chapter". This is accepted and generates no error.
<xs:complexType name="bookType3">
<xs:complexContent>
<xs:restriction base="hierarchicalContainer">
<xs:sequence>
<xs:element ref="number"/>
<xs:element ref="chapter"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
Any idea of why it works this way?
Regards
Fabio
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