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Re: dtd mixed content

• To: jcowan@r...
• Subject: Re: dtd mixed content
• From: Mike Fitzgerald <mikefz@w...>
• Date: Tue, 02 Mar 2004 16:27:06 -0700
• Cc: xml-dev@l...
• In-reply-to: <20040302230704.GF3253@s...>
• References: <20040302170654.C24A93C8DD@s...> <40450C4E.1030401@w...> <20040302230704.GF3253@s...>
• User-agent: Mozilla Thunderbird 0.5 (Windows/20040207)

<link>
  Hi <b>there</b> you
</link>

and

<link>
  <img/>
</link>

are valid (xsv) with regard to

   <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"/>

so is

<link>
  Hi <img/> there you
</link>

but that's probably no what Fernando wants! RELAX NG wins again.

Mike

jcowan@r... wrote:

> Mike Fitzgerald scripsit:
> 
> 
>>Fernando Cubria wrote:
>>
>>>¿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.
>>
>>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"/>
> 
> 
> Actually, that says "element link {(b | img) & text}" in RNC syntax,
> whereas he wants "element link {(b | text)* | img}".  Neither DTD nor
> XSD can handle such a content model.  The content models of b and img
> are not given.
> 
> Fernando, consider using a RELAX NG schema instead of a DTD.
> See http://www.relaxng.org .

• References:
  • dtd mixed content
    • From: Fernando Cubria <fcubria@l...>
  • Re: dtd mixed content
    • From: Mike Fitzgerald <mikefz@w...>

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