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