CODEWITHSUNDEEP
xmldtd
senfo
senfo

Reputation: 29026

Defining Duplicate Child Elements in DTD

I'm trying to generate a DTD and I was wondering how to allow child elements to contain elements that have already been declared in the DTD. Do you have to declare them again? As an example:

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE document [
  <!ELEMENT document (author,title,body)>
  <!ELEMENT author (#PCDATA)>
  <!ELEMENT title (#PCDATA)>
  <!ELEMENT body (br*,hr*,img*,table*)>
  <!ELEMENT br EMPTY>
  <!ELEMENT hr EMPTY>
  <!ELEMENT img EMPTY>
  <!ELEMENT table (tr+)>
  <!ELEMENT tr (td+)>
  <!ELEMENT td (#PCDATA)>



<!--hr element-->
  <!ATTLIST hr width CDATA "0">



<!--img element-->
  <!ATTLIST img height CDATA "0">
  <!ATTLIST img src CDATA #REQUIRED>
  <!ATTLIST img width CDATA "0">



<!--td element-->
  <!ATTLIST td width CDATA "0">
]>
<document>
  <author>My Author</author>
  <title>My Title Test</title>
  <body>
    <hr />
    <table>
      <tr>
        <td>Would like elements here</td>
      </tr>
    </table>
  </body>
</document>

In the above XML, I'd like to, for example, allow the br, hr, img and table tags to be within the td tag. Do I have to redefine those elements in the DTD?

I appreciate any help and thank you in advance.

Upvotes: 1

Views: 2365

Answers (1)

akf
akf

Reputation: 39485

you should reference them in the <!ELEMENT td> definition

edit: if you want to maintain the parsed character data in the td element along with the new tags, you can define a mixed content element. example:

<!ELEMENT td (#PCDATA | br? | hr? | img?)>

see element declarations at w3.org

Upvotes: 2

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