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Large output in XMLwith Unicode and namespace Thomas Aglassinger http://roskakori.at

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We wanted to write this:

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We wanted to write this: XML

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We wanted to write this: XML Unicode

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We wanted to write this: Name XML Unicode spaces

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We wanted to write this: NameLarge XML Unicode spaces

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We already knew how to read XML.● xml.dom.minidom.parse()● xml.etree.ElementTree.parse()● xml.sax.parse()● lxml.etree.parse() http://encyclopediadramatica.se/File:Bill_Nye_Expert.jpg

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So we went to the Python Library... http://upload.wikimedia.org/wikipedia/commons/2/2b/Melk_-_Abbey_-_Library.jpg

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...and we were like: http://www.apple.com/switch/stories/ellenfeiss.html (in 2002)

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xml.dom.minidom

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xml.dom.minidom Explicit attribute for name space Verbose way to add attributes Many lines of code

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xml.dom.minidom● “Users [...] who would like to write less code for processing XML files should consider using the xml.etree.ElementTree module instead” (The Python Standard Library, Chapter 19, Structured Markup) http://www.destructoid.com/blogs/Sevre/femshep-5-a-space-opera-208844.phtml

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xml.etree

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xml.etree Clark notation instead of XPath RequiresPython 2.7 Generally shorter Similar issues but wider with lxml.etree

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Memory issues● So far, XML-Document is built in memory● Wont work well for large sets of data● We need a streaming interface

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codecs.open() and write()

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codecs.open() and write() It just doent feel “right” Manualescaping

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saxutils.XMLGenerator

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saxutils.XMLGeneratorNo support for <x/>, only <x></x>

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Lack of basic validation● Are all tags closed?● In the correct order?● Has a namespace been registered before usage?

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So we had to go all kinky... http://mylittlefacewhen.com/f/3781/

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...and write yet-another XML module http://www.110pounds.com/?p=6880

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Before you judge too harshly: It just writes XML!

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loxun

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loxun Compact Defaults to namespaceUTF-8 output syntax Compact attribute syntax

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loxun Supports with- statement Streaming interface for low memory usage No dependencies on other modulesPure Python 2.5+ Optimizes <x></x> to simply <x/>

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Raises XmlError if...● ...you add references to undefined name spaces● ...if you forget to close tags (elements)● ...if you build non-well formed documents● ...if you add non-ASCII characters in 8-bit strings

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Available from:● http://pypi.python.org/pypi/loxun/● https://github.com/roskakori/loxun● Open Source $ sudo pip install loxun Downloading/unpacking loxun Downloading loxun-1.3.zip Running setup.py egg_info for package loxun Installing collected packages: loxun Running setup.py install for loxunCode examples for this talk: Successfully installed loxunhttps://gist.github.com/3067859

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Try loxun for: Large output in XMLwith Unicode and namespace Also writes small ASCII files!