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http://www.fragbase.com/sql2xpath.php
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http://c2.com/cgi/wiki?PythonSingleton
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http://www.org.lcs.mit.edu/6.893/gl/p...l/article.php?story=20040225230722446
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http://www.python.org/pycon/dc2004/papers/24/metaclasses-pycon.pdf
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http://groovy.codehaus.org/index.html
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http://article.gmane.org/gmane.comp.python.sqlobject/1334
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http://peak.telecommunity.com/protocol_ref/module-protocols.html
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http://www.freenet.org.nz/python/pyshaper/#requirements
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http://www.dwerg.net/2004/articles/morelibxml