How can one access NS attributes through using ElementTree?
With the following:
<data xmlns="http://www.foo.net/a" xmlns:a="http://www.foo.net/a" book="1" category="ABS" date="2009-12-22">
When I try to root.get('xmlns') I get back None, Category and Date are fine, Any help appreciated..
Look at the effbot namespaces documentation/examples; specifically the parse_map function. It shows you how to add an ns_map attribute to each element which contains the prefix/URI mapping that applies to that specific element.
However, that adds the ns_map attribute to all the elements. For my needs, I found I wanted a global map of all the namespaces used to make element look up easier and not hardcoded.
Here's what I came up with:
import elementtree.ElementTree as ET
def parse_and_get_ns(file):
events = "start", "start-ns"
root = None
ns = {}
for event, elem in ET.iterparse(file, events):
if event == "start-ns":
if elem[0] in ns and ns[elem[0]] != elem[1]:
# NOTE: It is perfectly valid to have the same prefix refer
# to different URI namespaces in different parts of the
# document. This exception serves as a reminder that this
# solution is not robust. Use at your own peril.
raise KeyError("Duplicate prefix with different URI found.")
ns[elem[0]] = "{%s}" % elem[1]
elif event == "start":
if root is None:
root = elem
return ET.ElementTree(root), ns
With this you can parse an xml file and obtain a dict with the namespace mappings. So, if you have an xml file like the following ("my.xml"):
<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:dc="http://purl.org/dc/elements/1.1/"\
>
<feed>
<item>
<title>Foo</title>
<dc:creator>