New submission from Silverback Networks: ET reads a default-namespaced (xmnls="whatever") file correctly but won't write it back out.
The error given is: ValueError: cannot use non-qualified names with default_namespace option The XML reference is reasonably clear on this: http://www.w3.org/TR/REC-xml-names/#defaulting "Default namespace declarations do not apply directly to attribute names;" "The namespace name for an unprefixed attribute name always has no value." Therefore, it is not an error to write non-qualified _attribute_ names with a default namespace; they're just considered un-namespaced anyway. The trivial case where a file is read in with a default namespace and written out with the same one should make it obvious: from xml.etree.ElementTree import * register_namespace('svg', 'http://www.w3.org/2000/svg') svg = ElementTree(XML(""" <svg width="12cm" height="4cm" viewBox="0 0 1200 400" xmlns="http://www.w3.org/2000/svg"; version="1.1"> <rect x="1" y="1" width="1198" height="398" fill="none" stroke="blue" stroke-width="2" /> </svg> """)) svg.write('simple_new.svg',encoding='UTF-8',default_namespace='svg') Yet this will fail with the error above. By leaving off default_namespace, every element is pointlessly prefixed by 'svg:' in the resulting file, but it does work. ---------- components: XML messages: 181005 nosy: silverbacknet priority: normal severity: normal status: open title: ElementTree incorrectly refuses to write attributes without namespaces when default_namespace is used type: behavior versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17088> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
