[xsl] Regular expressions in a schema

[Chuck Paussa <cpaussa at myrealbox dot com>]

I'm trying to write a validating pattern in my schema to allow from 1 to 
4 occurrances of the pattern  [+]?[\.0-9]+%[ ]?
(That's 1 - 4 real number percentages delimited by a space)

    <simpleType name = "background_position_percentage_Type">
        <restriction base = "string"><!-- percentage_Type{1,4} -->
            <pattern value = "[[+]?[\.0-9]+%[ ]?]{1,4}"/>
        </restriction>
    </simpleType>

doesn't work because I can't put [] inside of an atom. Does anyone know 
if there is a proper way to write this pattern?

Chuck


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