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You are unlikely to need it, but the XML Schema 1.1 regular expression syntax allows you to define a character class as one set of characters minus another set.This pattern, for example, will check for the word "Copyright" at the beginning of a value an ignore what follows it: * to skip zero or more arbitrary characters at the beginning or end of the pattern if you need to match only a substring. Also remember that all patterns are anchored at both ends.
Use the "<" and ">" character entities in your patterns if you need to match them.Remember, "" are special characters to XML.The quantifier expression " The latter will produce a syntax error in the schema file.The quantifier character '?' means "zero or one time" '*' means "zero or more times" '+' means "one or more times".The wildcard character '.' matches any single character.The hyphen ('-') can be used to indicate a range and the carat ('^') negates the class if it is the first character in the class. Character classes are defined using ''.Single characters match themselves literally unless they are special characters.These points should be familiar from using regular expressions in other contexts: So if you are trying to define a facet for a data type in your local dictionary, do this:
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The full syntax available for use in XML Schema 1.1 documents is defined in Appendix G of the W3C Standard: ĭata dictionary designers might encounter XML Schema regular expressions if they make use of the option in defining their local attributes. It is very similar to the syntax used by Perl, but not sufficiently similar that you can plug in even a simple Perl regular expression and expect it to work as it would in a Perl script. The XML Schema language has its own regular expression syntax and specialized notation.