On Tuesday 10 October 2006 19:24, Vines, John (Civ, ARL/CISD) wrote:
# I'm having a bit of an issue understanding how to create an
# entity . My understanding is to create an instance of a document and
# use the "createEntityReference(name)" method to create the entity.
# from xml.dom import getDOMImplementation
#
# impl = getDOMImplementation()
# doctype = impl.createDocumentType( 'Xdmf', None, 'Xdmf.dtd' )
# self.xml_doc = impl.createDocument(None, "Xdmf", doctype)
# self.root = self.xml_doc.documentElement
# self.xml_doc.appendChild( self.root )
On my system, getDOMImplementation returns the minidom implementation:
Python 2.4.2 (#2, Nov 20 2005, 17:04:48)
[GCC 4.0.3 20051111 (prerelease) (Debian 4.0.2-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from xml.dom import getDOMImplementation
>>> impl = getDOMImplementation()
>>> impl
<xml.dom.minidom.DOMImplementation instance at 0xb7cf4d8c>
Which does not appear to have a createEntityReference() method:
>>> doc = impl.createDocument(None, 'a', None)
>>> [k for k in dir(doc) if k.startswith('create')]
['createAttribute', 'createAttributeNS', 'createCDATASection',
'createComment', 'createDocumentFragment', 'createElement', 'createElementNS',
'createProcessingInstruction', 'createTextNode']
The 4DOM implementation, however, does have such a method:
>>> newImpl = getDOMImplementation('4DOM')
>>> newImpl
<xml.dom.DOMImplementation.DOMImplementation instance at 0xb7cf4f4c>
>>> doc = newImpl.createDocument(None, 'a', None)
>>> hasattr(doc, 'createEntityReference')
True
Which you use as one might expect:
>>> lt = doc.createEntityReference('lt')
>>> doc.documentElement.appendChild(lt)
<EntityReference Node at -482df7b4: 'lt'>
>>> from xml.dom.ext import Print # 4DOM does not have a toxml() method
>>> from StringIO import StringIO
>>> buf = StringIO()
>>> Print(doc, buf)
>>> buf.seek(0)
>>> print buf.read()
<?xml version='1.0' encoding='UTF-8'?><a><</a>
Another DOM implementation that you might be interested in is pxdom:
http://www.doxdesk.com/software/py/pxdom.html
All these DOM implementations have their strengths and weaknesses.
Hope that helped,
--anjansamanta
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