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Posted to c-dev@xerces.apache.org by "Grey, Anthony A" <An...@AbbeyNational.co.uk> on 2001/09/20 12:11:54 UTC
Why does Xerces not allow restriction for a simpleContent type
The following schema definition produces an exception in the Xerces
validator (version 1.5.1, line 2964 of TraverseSchema.cpp file, method
TraverseSchema::traverseSimpleContentDecl() ): -
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="ServiceCall">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="MiddlewareHeader" minOccurs='1' maxOccurs='1'/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="MiddlewareHeader">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="INF_SVCNAME" type="INF_SVCNAME"
nillable="false"/>
<xsd:element name="INF_VERSIONNO"
type="INF_VERSIONNO" nillable="false"/>
</xsd:sequence>
<xsd:attribute name="version" type="xsd:string" use='required'/>
</xsd:complexType>
</xsd:element>
<xsd:complexType name="INF_SVCNAME">
<xsd:simpleContent>
<xsd:extension base="xsd:string">
<xsd:attribute name="Row" type="xsd:integer"
use="optional"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
<xsd:complexType name="INF_VERSIONNO">
<xsd:restriction base="xsd:string">
<xsd:minLength value="1"/>
<xsd:whiteSpace value="preserve"/>
<xsd:maxLength value="50"/>
</xsd:restriction>
</xsd:complexType>
</xsd:schema>
The error message generated is: -
Error at file d:\xerces-c-src1_5_1\samples\data\Abbey test 2.xml, line 2,
char 117
Message: The type 'xsd:string' is a simple type. It cannot be used in a
derivation by RESTRICTION for a complexType
Error at file d:\xerces-c-src1_5_1\samples\data\Abbey test 2.xml, line 7,
char 32
Message: Attribute '{}Row' is not declared for element 'INF_VERSIONNO'
If I change the restriction to an extension, like the INF_SVCNAME element
(obviously removing the min/maxlength and white space elements) then it
works fine. The W3C recommendation implies that restriction is a valid
content type
(http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#element-simpleContent),
so what am I doing wrong?
Tony.
Important:
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Re: Why does Xerces not allow restriction for a simpleContent type
Posted by Khaled Noaman <kn...@ca.ibm.com>.
According to the schema spec (http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#coss-ct):
In a complexType definition, if the base is a simple type, you must use 'extension' as the derivation method.
Schema Component Constraint: Complex Type Definition Properties Correct
All of the following must be true:
1 ...
2 If the {base type definition} is a simple type definition, the {derivation method} must be extension.
3 ...
Khaled
"Grey, Anthony A" wrote:
> The following schema definition produces an exception in the Xerces
> validator (version 1.5.1, line 2964 of TraverseSchema.cpp file, method
> TraverseSchema::traverseSimpleContentDecl() ): -
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
>
> <xsd:element name="ServiceCall">
> <xsd:complexType>
> <xsd:sequence>
> <xsd:element ref="MiddlewareHeader" minOccurs='1' maxOccurs='1'/>
> </xsd:sequence>
> </xsd:complexType>
> </xsd:element>
>
> <xsd:element name="MiddlewareHeader">
> <xsd:complexType>
> <xsd:sequence>
> <xsd:element name="INF_SVCNAME" type="INF_SVCNAME"
> nillable="false"/>
> <xsd:element name="INF_VERSIONNO"
> type="INF_VERSIONNO" nillable="false"/>
> </xsd:sequence>
> <xsd:attribute name="version" type="xsd:string" use='required'/>
> </xsd:complexType>
> </xsd:element>
>
> <xsd:complexType name="INF_SVCNAME">
> <xsd:simpleContent>
> <xsd:extension base="xsd:string">
> <xsd:attribute name="Row" type="xsd:integer"
> use="optional"/>
> </xsd:extension>
> </xsd:simpleContent>
> </xsd:complexType>
> <xsd:complexType name="INF_VERSIONNO">
> <xsd:restriction base="xsd:string">
> <xsd:minLength value="1"/>
> <xsd:whiteSpace value="preserve"/>
> <xsd:maxLength value="50"/>
> </xsd:restriction>
> </xsd:complexType>
>
> </xsd:schema>
>
> The error message generated is: -
>
> Error at file d:\xerces-c-src1_5_1\samples\data\Abbey test 2.xml, line 2,
> char 117
> Message: The type 'xsd:string' is a simple type. It cannot be used in a
> derivation by RESTRICTION for a complexType
>
> Error at file d:\xerces-c-src1_5_1\samples\data\Abbey test 2.xml, line 7,
> char 32
> Message: Attribute '{}Row' is not declared for element 'INF_VERSIONNO'
>
> If I change the restriction to an extension, like the INF_SVCNAME element
> (obviously removing the min/maxlength and white space elements) then it
> works fine. The W3C recommendation implies that restriction is a valid
> content type
> (http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#element-simpleContent),
> so what am I doing wrong?
>
> Tony.
>
> Important:
>
> Internet communications are not necessarily secure and may be intercepted or changed after they are sent.
> The Abbey National Group does not accept liability for any such changes. If you wish to confirm the origin or content of this communication, please contact the sender using an alternative means of communication.
>
> This communication does not create or modify any contract.
>
> If you are not the intended recipient of this communication you should destroy it without copying, disclosing or otherwise using its contents. Please notify the sender immediately of the error.
>
> The Abbey National Group comprises Abbey National plc and its subsidiary group of companies.
>
> Abbey National plc. Registered Office: Abbey House, Baker Street, London, NW1 6XL. Reg. No. 2294747.
> Registered in England.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: xerces-c-dev-unsubscribe@xml.apache.org
> For additional commands, e-mail: xerces-c-dev-help@xml.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: xerces-c-dev-unsubscribe@xml.apache.org
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