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Hi Bob, Thanks for checking the example below. I am afraid it was just used by ht to show some concept that I was pondering and need not actually run to prove the point (it does though, simply remove the type declaration in the elements x, y, z) I moved the ensuing discussion to xmlschema-dev@w... by suggestion of ht. Kind Regards, Gregor 2005/4/28, Bob Foster <bob@o...>: > Hmm. XercesJ reports three errors (not warnings) from this schema of the > form: > > Error - src-resolve: Cannot resolve the name 'unknownX' to a(n) 'type > definition' component. > > Where X is one of: 1, 2, 3; > > Bob Foster > > Henry S. Thompson wrote: > > I'll answer a simple question which I understand, and which I _think_ > > is what you're asking. > > > > The following XML document is valid: > > > > <!DOCTYPE root [ > > <!ELEMENT root (a|x)> > > <!ELEMENT a (b|y)> > > <!ELEMENT b (c|z)> > > <!ELEMENT c EMPTY> > > ]> > > <root><a><b><c/></b></a></root> > > > > Note it contains no declarations for the elements x, y and z. > > > > The corresponding schema document successfully validates the same > > instance: > > > > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> > > <xs:element name="root"> > > <xs:complexType> > > <xs:choice> > > <xs:element ref="a"/> > > <xs:element ref="x"/> > > </xs:choice> > > </xs:complexType> > > </xs:element> > > > > <xs:element name="a"> > > <xs:complexType> > > <xs:choice> > > <xs:element ref="b"/> > > <xs:element ref="y"/> > > </xs:choice> > > </xs:complexType> > > </xs:element> > > > > <xs:element name="b"> > > <xs:complexType> > > <xs:choice> > > <xs:element ref="c"/> > > <xs:element ref="z"/> > > </xs:choice> > > </xs:complexType> > > </xs:element> > > > > <xs:element name="c"> > > <xs:complexType/> > > </xs:element> > > > > <xs:element name="x" type="unknown1"/> > > <xs:element name="y" type="unknown2"/> > > <xs:element name="z" type="unknown3"/> > > </xs:schema> > > > > So yes, you can do incremental development of a schema for a complex > > XML language. > > > > ht > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php> > >
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