[xsl] Regular expressions in a schema

[Chuck Paussa <cpaussa@xxxxxxxxxxxxx>]

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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