Embedding Content as Element Content or As An Attribute Value

Tim Bray tbray at textuality.com
Thu Jan 8 21:57:52 GMT 1998

At 11:06 AM 30/09/97 -0400, Tyler Baker wrote:
> I am a little perplexed
>about an element declaration of the form:
><!ELEMENT Foo (bar1 | bar2 | bar3)*>

any number of bar1, bar2, and bar3 elements in any order

<!ELEMENT Foo (bar1|bar2|bar3)>

one child element, either bar1, bar2, or bar3

><!ELEMENT Foo (bar1, bar2, bar3)*>

0 or more bar1, bar2, bar3 sequences.

><!ELEMENT Foo (bar1?, bar2?, bar3?)>

any of:
bar1 bar2
bar1 bar3
bar2 bar3
bar1 bar2 bar3

I agree that the semantic of '|' is not as it is in some other
systems. -T.

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