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Re: How to implement getElementById() with Xerces using XMLSch

• To: xml-dev@l...
• Subject: Re: How to implement getElementById() with Xerces using XMLSchema?
• From: "Thomas B. Passin" <tpassin@c...>
• Date: Tue, 27 Aug 2002 08:34:52 -0400
• References: <NCBBJFOKMLKEONMCPNMMIENLCDAA.gerd.rosarius@b...>

[H.-Gerd Rosarius]

> If I use a DTD to specify my id-attribute and assign it to my
> XML file, getElementByID() returns an object of type Element.
> If I use a XML Schema I get 'null' instead.
>

It does not work because you have not declared your "id" attribute to be of
type ID.   Type NMTOKEN is NOT the same as type ID (although the lexical
rules are the same).  So use xs:ID. Fix this declaration:

<xs:attribute name="id" type="xs:NMTOKEN" use="required"/>

Cheers,

Tom P

> The XML Schema:
> ---------------
> <?xml version="1.0" encoding="UTF-8"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> elementFormDefault="qualified">
> <xs:element name="katalog">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="book" maxOccurs="unbounded">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="author" type="xs:string"/>
> </xs:sequence>
> <xs:attribute name="id" type="xs:NMTOKEN" use="required"/>
> </xs:complexType>
> </xs:element>
> </xs:sequence>
> </xs:complexType>
> <xs:key name="schluessel">
> <xs:selector xpath=".//book"/>
> <xs:field xpath="@id"/>
> </xs:key>
> </xs:element>
> </xs:schema>
>

• References:
  • How to implement getElementById() with Xerces using XML Schema?
    • From: "H.-Gerd Rosarius" <gerd.rosarius@b...>

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