DTD elements definition question

[es@d]

Hello there,

I'm trying to build what is in basis a screen scraper sofware that takes an url as input and produces an xml file as output.I wanted to introduce something like "document definitiion" for the source URL, i.e.

<document id="some_news_site_without_rss"
url="http://www.example.com/news.html">
<news repeat="true">
<article>
<title begin="somehtml" end="somehtml">
</article>

</news>
</document>

would something like

<document>
<news>
<article>
<title>Some title 1</title>
</article>
<article>
<title>Some title 2</title>
</article>
<article>
<title>Some title 3</title>
</article>
</news>
</document>

I hope you get the idea.

My problem is that I've tried to describe this "definition language" using DTD, but as far as I can see DTD doesn't support/specifies something like "I want to have one fix parent element - document, all the other elements are user-specified (unspecified), but they have to be closed and have following attributes...".

I'm not so deep into XML/SGML thing so maybe I'm just missing some basic thing.

Thanks,

Esad Hajdarevic

 

[Martin Honnen]

es@d wrote:

I'm trying to build what is in basis a screen scraper sofware that takes an url as input and produces an xml file as output.I wanted to introduce something like "document definitiion" for the source URL, i.e.

<document id="some_news_site_without_rss"
url="http://www.example.com/news.html">
<news repeat="true">
<article>
<title begin="somehtml" end="somehtml">
</article>

</news>
</document>

would something like

<document>
<news>
<article>
<title>Some title 1</title>
</article>
<article>
<title>Some title 2</title>
</article>
<article>
<title>Some title 3</title>
</article>
</news>
</document>

I hope you get the idea.

My problem is that I've tried to describe this "definition language" using DTD, but as far as I can see DTD doesn't support/specifies something like "I want to have one fix parent element - document, all the other elements are user-specified (unspecified), but they have to be closed and have following attributes...".

I'm not so deep into XML/SGML thing so maybe I'm just missing some basic thing.

It is correct that if you use a DTD you need to define all elements and attributes otherwise validation will fail. With an XML schema you can define some elements while others can be skipped during validation, see http://www.w3.org/TR/xmlschema-0/ http://www.w3.org/TR/xmlschema-0/#any