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Re: dtd mixed content

• To: Fernando Cubria <fcubria@l...>
• Subject: Re: dtd mixed content
• From: Mike Fitzgerald <mikefz@w...>
• Date: Tue, 02 Mar 2004 15:35:58 -0700
• Cc: "xml-dev@l..." <xml-dev@l...>
• In-reply-to: <20040302170654.C24A93C8DD@s...>
• References: <20040302170654.C24A93C8DD@s...>
• User-agent: Mozilla Thunderbird 0.5 (Windows/20040207)

Fernando Cubria wrote:
 > Hello:
 > ¿Is there a way to tell, in dtd syntax, that a "link" element can contain any 
combination of text and "b" elements or just one "img" element?
 > I have tried with
 > <!ELEMENT link  ((#PCDATA | b)* | img) >
 > but I get an error.
 > Thank you.
 > Fernando

You can do this using choice. You could do this in XML Schema (xs:choice):

<xs:element name="link">
  <xs:complexType mixed="true">
    <xs:choice>
     <xs:element ref="b"/>
     <xs:element ref="img"/>
    </xs:choice>
   </xs:complexType>
  </xs:element>
<xs:element name="b" type="xs:string"/>
<xs:element name="img"/>

Or this in RELAX NG (choice):

<element name="link">
  <choice>
   <ref name="b"/>
   <ref name="img"/>
  </choice>
</element>

<define name="b">
   <mixed>
    <element name="b"><text/></element>
   </mixed>
</define>

<define name="img">
   <element name="img"><empty/></element>
</define>

Or in RELAX NG's compact syntax (| is choice):

element link { b | img }
b = mixed {element b { text }}
img = element img { empty }


Mike


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• References:
  • dtd mixed content
    • From: Fernando Cubria <fcubria@l...>

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