Hello,
We are working with XML Schemas and we have detected that, using Xerces'
validation, there are some errors that don't appear if we use other tools to
validate our schemas.
Errors happen when we have a base type that contains a choice particle followed
by sequence or choice particles and we want to define a restricted type. Xerces
only allow one element in those sequence or choice particles. But all the
elements should be allowed.
This is an example:
- This is the base type, that contains a choice particle followed by
two sequence particles:
<xsd:complexType name="base">
<xsd:choice>
<xsd:sequence minOccurs="0">
<xsd:element name="a" type="xsd:string" minOccurs="0"/>
<xsd:element name="b" type="xsd:string" minOccurs="0"/>
<xsd:element name="c" type="xsd:string" minOccurs="0"/>
<xsd:element name="d" type="xsd:string" minOccurs="0"/>
<xsd:element name="e" type="xsd:string" minOccurs="0"/>
<xsd:element name="f" type="xsd:string" minOccurs="0"/>
<xsd:element name="g" type="xsd:string" minOccurs="0"/>
<xsd:element name="h" type="xsd:string" minOccurs="0"/>
<xsd:element name="i" type="xsd:string" minOccurs="0"/>
</xsd:sequence>
<xsd:sequence minOccurs="0">
<xsd:element name="j" type="xsd:string" minOccurs="0"/>
<xsd:element name="k" type="xsd:string" minOccurs="0"/>
</xsd:sequence>
</xsd:choice>
</xsd:complexType>
- This is a restricted type that contains the same choice particle
followed only by one of the sequence particles. Xerces find errors at this type.
<xsd:complexType name="restricted1">
<xsd:complexContent>
<xsd:restriction base="base">
<xsd:choice>
<xsd:sequence>
<xsd:element name="j" type="xsd:string"/>
<xsd:element name="k" type="xsd:string"/>
</xsd:sequence>
</xsd:choice>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>
These are the errors that Xerces find:
rcase-MapAndSum.2: Group's occurrence range, (2,2), is not a valid restriction
of base group's occurrence range, (1,1).
derivation-ok-restriction.5.4.2: Error for type 'restricted1'. The particle of
the type is not a valid restriction of the particle of the base.
- This is another restricted type. Xerces doesn't find errors at it
because the sequence particle only contains one element.
<xsd:complexType name="restricted2">
<xsd:complexContent>
<xsd:restriction base="base">
<xsd:choice>
<xsd:sequence>
<xsd:element name="j" type="xsd:string"/>
</xsd:sequence>
</xsd:choice>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>
We believe this is caused by a Xerces' bug because we think that our schema is
valid according to W3C Recommendation (http://www.w3.org/TR/xmlschema-1/
<http://www.w3.org/TR/xmlschema-1/> ). Could you tell us if we are right?
Thank you very much.
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