[issue20375] ElementTree: Document handling processing instructions

[Nikolaus Rath]

New submission from Nikolaus Rath:

(This issue was branched of from #9521).

When parsing XML, etree currently skips over all processing instructions and comments. However, both can be represented in the tree and are also written out when generating XML.

The attached patch documents this (IMO surprising) behavior.

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assignee: docs at python
components: Documentation
files: xml.etree_r1.patch
keywords: patch
messages: 209036
nosy: docs at python, eli.bendersky, eric.araujo, ezio.melotti, georg.brandl, nikolaus.rath, scoder
priority: normal
severity: normal
status: open
title: ElementTree: Document handling processing instructions
type: enhancement
versions: Python 2.7, Python 3.3, Python 3.4
Added file: http://bugs.python.org/file33675/xml.etree_r1.patch

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<http://bugs.python.org/issue20375>
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