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Extension to ``htmlfill`` that can parse out schema-defining
statements.
You can either pass ``SchemaBuilder`` to ``htmlfill.render`` (the
``listen`` argument), or call ``parse_schema`` to just parse out a
``Schema`` object.
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Given an HTML form, parse out the schema defined in it and return
that schema.
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Force single items into a list. This is useful for checkboxes.
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