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[2] XPath and XQuery Functions and Operators 3.1. 21 March 2017. Michael Kay. World Wide Web Consortium (W3C). https://www.w3.org/TR/xpath-functions-31/.

[3] XQuery and XPath Data Model 3.1. 21 March 2017. Norman Walsh, John Snelson, and Andrew Coleman. World Wide Web Consortium (W3C). https://www.w3.org/TR/xpath-datamodel-31/.

[4] Norman Walsh. XML Calabash Reference. 06 March 2018. http://xmlcalabash.com/docs/reference/.

[5] Hans-Juergen Rennau. Combining graph and tree: writing SHAX, obtaining SHACL, XSD and more. Jiří Kosek. XML Prague 2018. February 8–10, 2018. Prague, Czech Republic. . 2018. 107-135. http://archive.xmlprague.cz/2018/files/xmlprague-2018-proceedings.pdf.

[6] Achim Berndzen and Gerrit Imsieke. Interoperability of XProc pipelines. A real world publishing scenario. Charles Foster. XML London 2016. June 4–5, 2016. London, United Kingdom. . 2016. 82-98. doi:doi:10.14337/XMLLondon16.Berndzen01