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   Re: [xml-dev] dtd mixed content

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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:element ref="b"/>
     <xs:element ref="img"/>
<xs:element name="b" type="xs:string"/>
<xs:element name="img"/>

Or this in RELAX NG (choice):

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

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

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

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

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


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