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The only way I've been able to get it to work so far is by using the default XML parser and adding a non-empty system URL to the document:

>>> html = etree.parse(StringIO('''<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML></HTML>'''))
>>> etree.tostring(html, method="xml")
'<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML/>'
>>> etree.tostring(html, method="html")
'<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML></HTML>'

The same thing using the HTMLParser results in the same docinfo, but not the desired output:

>>> html = etree.parse(StringIO('''<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML></HTML>'''), etree.HTMLParser())
>>> etree.tostring(html, method="html")
'<html></html>'

bosmacs 2010-10-12 18:01:38

Thanks, but my input is usually invalid XML -- therefore HTML parser. I filed a bug: https://bugs.launchpad.net/lxml/+bug/659367

liori 2010-10-12 19:37:30

No problem, I figured that might be the case.

bosmacs 2010-10-12 19:41:20

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lxml, missing doctype when serialized

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