Hi, I'm having problem creating a DTD to do what I need it to do.
Here's what I need.
Page element can have one/zero form element or zero/many other element.
Examples:
One:
<page>
<other></other>
<other></other>
<form></form>
<other></other>
</page>
Two:
<page></page>
Three:
<page>
<other></other>
<other></other>
</page>
Four:
<page>
<form></form>
</page>
All the above should be valid. As long as there is more than one <form>
tag, it's invalid.
i.e: <page>
<form></form>
<form></form>
</page>
Should generate a ParseError. If possible, I would like the example below
to generate an error as well.
<page>
<other>
<form></form>
</other>
<form></form>
</page>
I was going along the line of <!ELEMENT page (form?|other*)> but only
examples 2 - 3 will be valid and not example 1. If I write it as <!ELEMENT
page (form?|other*)*>, it's valid for examples 1-4 but it is also valid for
the invalid multiple <form> tag example.
Can anyone help?
Callista
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