[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Performance Vs Size of XSD + Extension of restriction
----- Original Message From: "Sudheshna Iyer" > Pete, I didn't get what you are saying. > > I want my 'ChildType' to inherit the restrictions 'minLength' and > 'whiteSpace' from 'OrigType' and > has its own 'maxLength'. So will the following info solve the requirements > relating to both syntax and semantics? > > <xs:simpleType name="OrigType"> > <xs:restriction base="xs:string"> > <xs:minLength value="1"/> > <xs:maxLength value="20"/> > <xs:whiteSpace value="collapse"/> > </xs:restriction> > </xs:simpleType> > > <xs:simpleType name="ChildType"> > <xs:restriction base="OrigType"> > <xs:maxLength value="40"/> > </xs:restriction> > </xs:simpleType> As Michael said, restriction restricts what a type can accept. So if you want to define types that only accept subsets of values that other types accept, then you have to start off defining the least restricted type and then progressively define each more restricted type from the previously (less) restricted type. A type that accepts a string of 40 characters is less restricted than a string that accepts a string of 20 characters. Therefore, in your case you have to define ChildType first. Hence, using your names, you get: <xs:simpleType name="ChildType"> <xs:restriction base="xs:string"> <xs:minLength value="1"/> <xs:maxLength value="40"/> <xs:whiteSpace value="collapse"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="OrigType"> <xs:restriction base="ChildType"> <xs:maxLength value="20"/> </xs:restriction> </xs:simpleType> OrigType will inherit the restrictions of ChildType. So OrigType is equivalent to: <xs:simpleType name="OrigType"> <xs:restriction base="ChildType"> <xs:minLength value="1"/> <xs:maxLength value="20"/> <xs:whiteSpace value="collapse"/> </xs:restriction> </xs:simpleType> Note that I'm referring to order of derivation here, not the order they appear in the XSD file (which isn't) significant. So the XSD file contents could equally be: <xs:simpleType name="OrigType"> <xs:restriction base="ChildType"> <xs:maxLength value="20"/> </xs:restriction> </xs:simpleType> <xs:simpleType name="ChildType"> <xs:restriction base="xs:string"> <xs:minLength value="1"/> <xs:maxLength value="40"/> <xs:whiteSpace value="collapse"/> </xs:restriction> </xs:simpleType> HTH, Pete. -- ============================================= Pete Cordell Tech-Know-Ware Ltd for XML to C++ data binding visit http://www.tech-know-ware.com/lmx (or http://www.xml2cpp.com) =============================================
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