**********
References
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.. [Hue97] Huet, G. The Zipper. *J. Functional Programming* **7** (5):
       549–554, 1997. Available online__.

__ http://gallium.inria.fr/~huet/PUBLIC/zip.pdf

.. [PEP484] van Rossum, G.; Lehtosalo, J.; Langa, Ł. *Type Hints*.
        `PEP 484`__, Python Software Foundation, 2014.

__ https://www.python.org/dev/peps/pep-0484

.. [RFC4648] Josefsson, S. *The Base16, Base32, and Base64 Data Encodings*. `RFC 4648`__, IETF, 2006. 18 p.

__ https://rfc-editor.org/rfc/rfc4648.html

.. [RFC6241] Enns, R. (ed.) et al. *Network Configuration Protocol
         (NETCONF)*. `RFC 6241`__, IETF, 2011. 113 p. ISSN
         2070-1721.

__ https://rfc-editor.org/rfc/rfc6241.html

.. [RFC6536] Bierman, A.; Bjorklund, M. *Network Configuration
         Protocol (NETCONF) Access Control Model*. `RFC 6536`__,
         IETF, 2012. 49 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc6536.html

.. [RFC6901] Bryan, P. (ed.); Zyp, K.; Nottingham, M. *JavaScript
         Object Notation (JSON) Pointer*. `RFC 6901`__,
         IETF, 2013. 8 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc6901.html

.. [RFC7895] Bierman, A.; Bjorklund, M.; Watsen, K. *YANG Module
         Library*. `RFC 7895`__, IETF, 2016. 13 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc7895.html

.. [RFC7950] Bjorklund, M. (ed.). *The YANG 1.1 Data Modeling Language*.
         `RFC 7950`__, IETF, August 2016. 217 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc7950.html

.. [RFC7951] Lhotka, L. *JSON Encoding of Data Modeled with YANG*.
       `RFC 7951`__, IETF, August 2016. 20 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc7951.html

.. [RFC7952] Lhotka, L. *Defining and Using Metadata with YANG*.
       `RFC 7952`__, IETF, August 2016. 20 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc7952.html

.. [RFC8040] Bierman, A.; Bjorklund, M.; Watsen, K. *RESTCONF Protocol*.
       `RFC 8040`__, IETF, 2017. 137 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc8040.html

.. [RFC8072] Bierman, A.; Bjorklund, M.; Watsen, K. *YANG Patch Media Type*.
       `RFC 8072`__, IETF, 2017. 39 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc8072.html

.. [RFC8340] Bjorklund, M.; Berger, L. (ed.) *YANG Tree Diagrams*.
       `RFC 8340`__, IETF, 2018. 13 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc8340.html

.. [RFC8407] Bierman, A. *Guidelines for Authors and Reviewers of YANG
       Data Model Documents*. `RFC 8407`__, IETF, 2018. 63 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc8407.html

.. [RFC8525] Bierman, A.; Bjorklund, M.; Schoenwaelder, J.; Watsen, K.; Wilton, R. *YANG Library*. `RFC 8525`__, IETF, 2019. 31 p. ISSN 2070-1721.

__ https://rfc-editor.org/rfc/rfc8525.html

.. [XPath] Clark, J.; DeRose S. *XML Path Language (XPath) Version
       1.0*. W3C Recommendation `REC-xpath-19991116`__, World Wide
       Web Consortium, 1999.

__ http://www.w3.org/TR/1999/REC-xpath-19991116/