Re: Algorithm for merging the pattern facets in a base simpleType with a subtype?

Michael Kay <[email protected]>
Newsgroups gmane.text.xml.schema.devel
Message-ID <[email protected]> 
> Since regular languages are closed under intersection,
> the result of a logical 'and' of two regexes is a regular
> language. And it will have an expression using XSD regular
> expressions.

Interesting. Is there a general algorithm for deriving that expression? 
In the absence of the "&&" and lookahead operators, it doesn't seem easy.

Michael Kay
Saxonica
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