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34 lines
1.3 KiB
Markdown
34 lines
1.3 KiB
Markdown
Utilities for determining whether characters belong to character classes defined
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by the XML specs.
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## Organization
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It used to be that the library was contained in a single file and you could just
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import/require/what-have-you the `xmlchars` module. However, that setup did not
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work well for people who cared about code optimization. Importing `xmlchars`
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meant importing *all* of the library and because of the way the code was
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generated there was no way to shake the resulting code tree.
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Different modules cover different standards. At the time this documentation was
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last updated, we had:
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* `xmlchars/xml/1.0/ed5` which covers XML 1.0 edition 5.
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* `xmlchars/xml/1.0/ed4` which covers XML 1.0 edition 4.
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* `xmlchars/xml/1.1/ed2` which covers XML 1.0 edition 2.
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* `xmlchars/xmlns/1.0/ed3` which covers XML Namespaces 1.0 edition 3.
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## Features
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The "things" each module contains can be categorized as follows:
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1. "Fragments": these are parts and pieces of regular expressions that
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correspond to the productions defined in the standard that the module
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covers. You'd use these to *build regular expressions*.
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2. Regular expressions that correspond to the productions defined in the
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standard that the module covers.
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3. Lists: these are arrays of characters that correspond to the productions.
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4. Functions that test code points to verify whether they fit a production.
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