indent is not available on our documentation server:
[build_parameters.py]
Traceback (most recent call last):
File "./param_parse.py", line 422, in <module>
do_emit(XmlEmit())
File "./param_parse.py", line 415, in do_emit
emit.close()
File "/home/wiki/build_wiki/ardupilot/Tools/autotest/param_metadata/xmlemit.py
", line 24, in close
etree.indent(self.paramfile)
AttributeError: module 'lxml.etree' has no attribute 'indent'