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Haskell bindings for the c14n implementation in libxml (XML canonicalisation). Unfortunately there is (at the time of writing) no pure Haskell implementation, so this seems like the best option.

You need to havelibxml2 installed, including on macOS (withbrew install libxml2). Then build withstack build.

TheText.XML.C14N module exports a function namedc14n which provides a mid-level interface to the canonicalisation function fromlibxml2. It will handle most of the marshalling, but not much more. For example:

> c14n[] c14n_1_1[]FalseNothing"<root>foo<!-- comment -->bar</root>""<root>foobar</root>"

The arguments, in order, are:

• Parser options, see the module documentation or thelibxml2 documentation
• The canonicalisation specification to use (c14n_1_0,c14n_exclusive_1_0, orc14n_1_1).
• A (potentially empty) list of namespace prefixes which is used when the canonicalisation specification used isc14n_exclusive_1_0
• A boolean value indicating whether to keep comments in the output or not.
• An XPath location path used to select a set of nodes that should be included in the canonicalised result