Text normalization with Invisible XML round-tripping

Invisible XML enables producing an XML document from a text value according to a grammar, which specifies rules for generating elements and attributes.

In certain use cases, round-tripping is required: unparsing the resulting XML document back into text.

Three steps are proposed for this unparsing:

• Grammar normalization by pruning meaningless rules and symbols.
• Inversion of the normalized grammar
• Parsing of the XML document with the inverted normalized grammar

Grammix is a Javascript implementation for parsing text values and unparsing XML documents according to an Invisible XML grammar. Grammix internally uses an Earley parser.