[Libguestfs] [PATCH v3 0/4] common/utils: Move libxml2 writer macros to a common header file.

[Richard W.M. Jones]

v1 was here:
https://www.redhat.com/archives/libguestfs/2018-October/msg00047.html
v2 was here:
https://www.redhat.com/archives/libguestfs/2018-October/msg00051.html

v3:

 - Back to using string/string_format and attribute/attribute_format.

 - Add both single_element and single_element_format.

 - Rebased and retested.

Rich.