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- From: Toivo Lainevool <tlainevool@yahoo.com>
- To: Jurg Wullschleger <Jurg.Wullschleger@mb.luth.se>, 'xml-dev' <xml-dev@ic.ac.uk>
- Date: Sat, 11 Dec 1999 17:40:00 -0800 (PST)
--- Jurg Wullschleger <Jurg.Wullschleger@mb.luth.se> wrote:
> the simplest form i can think of would look something like this: (examples
> in DTD syntax)
> there are only 4 types of elements:
>
> - empty elements
> <!ELEMENT name1 EMTPY >
>
> - elements that contain data
>
> <!ELEMENT name2 (#PCDATA) >
>
> - list elements
>
> <!ELEMENT name3 (name1|name2|name3|name4)* >
>
> - structural elements of a fixed length
>
> <!ELEMENT name4 ((name1|name2),name3,name4,(name5|name6|name7)) >
I would go even simpler than that. Don't allow nested brackets, #4 could be
represented like this:
<!ELEMENT name4 (nameA,name3,name4,nameB)>
<!ELEMENT nameA (name1|name2)>
<!ELEMENT nameB (name5|name6|name7)>
I recently wrote a quick and dirty DTD processor that generated java classes
for parsing valid XML documents, using this simplification in my DTDs made
things a whole lot easier.
Toivo Lainevool
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