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> -----Original Message-----
> From: PHDB _ [mailto:phdb2000@hotmail.com]
> Sent: Friday, June 20, 2003 04:54
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] Derivation problem
>
>
> Hello everybody,
>
> I've got a problem with Xerces when validating an XML file.
> Ths problem
> comes from the XML Schema itself,
> although designed without any problem with XML Spy 5.
>
> The erroneous part is the following :
>
> -------------------------------------------------
> Generator.xsd file
> -------------------------------------------------
>
> <xs:complexType name="Field_Type">
> <xs:sequence>
> <xs:element name="GenericProcess"
> type="Process_Type" minOccurs="0"
> maxOccurs="unbounded"/>
> </xs:sequence>
> <xs:attribute name="FieldType" type="xs:string" use="optional"/>
> <xs:attribute name="DefaultValue" type="xs:string"
> use="optional"/>
> <xs:attribute name="NbOfOccurence" type="xs:nonNegativeInteger"
> use="optional"/>
> </xs:complexType>
> <xs:complexType name="Process_Type">
> <xs:attribute name="StepName" type="xs:string" use="required"/>
> <xs:attribute name="Function" type="xs:string"
> use="required"/> </xs:complexType>
> <xs:complexType name="TextTableReference">
> <xs:complexContent>
> <xs:restriction base="Field_Type">
> <xs:sequence>
> <xs:element
> name="GenericProcess" type="Process_Type" minOccurs="0"
>
> maxOccurs="unbounded"/>
> </xs:sequence>
> <xs:attribute name="DefaultValue" fixed="996"/>
> </xs:restriction>
> </xs:complexContent>
> </xs:complexType>
>
> --------------------------------------------------
>
> Xerces gives me :
>
> [Error] Generator.xsd:183:18:
> derivation-ok-restriction.2.1.2: Error for
> type 'TextTableReference'. An
>
> attribute use in this type has a type which is not validly
> derived from the
> type of the matching attribute
>
> use in the base type.
>
> ---->I have this error because of the fixed="996", and even
> because of
> ---->the
> xs:attribute presence under
>
> restriction as far as I understand.
You have:
<xs:attribute name="DefaultValue" fixed="996"/>
without "type=", so the type is xs:anySimpleType. This is not a
restriction of xs:string. You should add type="xs:string"
As to the other errors you get, I don’t have a clue.
Alessandro Triglia
>
>
>
> [Error] Generator.xsd:180:44: cos-particle-restrict.2:
> Forbidden particle
> restriction:
>
> 'any:choice,sequence,all,elt'.
> [Error] Generator.xsd:180:44:
> derivation-ok-restriction.5.3.2: Error for
> type 'TextTableReference'. The
>
> particle of the type is not a valid restriction of the
> particle of the base.
>
> ----->These two extra errors may me due to the fact that
> Field_Type has
> ----->a
> child element (Generic Process),
>
> because if I change Field_Type and remove GenericProcess
> child element, I
> only have the first error adn not
>
> the three ones.
>
> I must admit that I don't find really clear the explanations
> provided by the
> w3c here
>
http://www.w3.org/TR/xmlschema-1/
Object Oreiented speaking I want to derive TextTableReference from
Field_Type and fixing teh attribute
DefauktValue.
Do you have any solution for my problem, apart from coding
TextTableReference as a standalone type with its
attributes and child, because I have many types derived in the same way
as
TextTableReference from
Field_Type.
Thanks in advance for your help.
_________________________________________________________________
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