![]() ![]() More complete descriptions are readily available on the web, should you wish to delve deeper. It also assumes you already have familiarity with regular expressions in some other context. Rather, it is a quick review of the features most likely to be encountered in the pds: schema or to be useful to dictionary writers. What follows is not an exhaustive guide to regular expressions in XML Schema. Patterns are used by PDS to define some specific data types in the pds: core namespace, so label designers and creators may also encounter them in schema files while investigating validation failures. 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.
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