charcode-is-valid-xml-name-character

Does a given character belong to XML spec's "Production 4 OR 4a" type (is acceptable for XML element's name)

v3.0.12 URL: https://unpkg.com/charcode-is-valid-xml-name-character@3.0.12/dist/charcode-is-valid-xml-name-character.esm.js

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4 4a HTML XHTML character element letter name production regex requirement satisfies spec valid xml