Mailman 3 May 2010 - lxml - The Python XML Toolkit

[lxml-dev] Beginner's question about lxml.
by Lashkara Singh May 11, 2010

May 11, 2010

Hello everyone. I am new to Python and this is the first time I will be doing proper development using a library. I will be using lxml for my project. Since I am new, I obviously don't know the standard method of doing stuff, so as to say. My project involves a XML parser in Python. Can anyone point me to some project that implements XML parsing with lxml / Python so that I can study the source code just to see how things are done. A small and compact project would do wonders. I know how to do stuff after reading the documentation, but if I see some sample code, it would help me in understanding stuff better. I tried to find some project related to this, but I was not successful. Any inputs would be appreciated.

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[lxml-dev] LD_LIBRARY_PATH issues
by Yogesh Tomar May 5, 2010

May 5, 2010

Hi all, Here is my wierd problem. I am using lxml v 2.2.6 on a custom python (2.6.1) installation that i did for a project. I use extensively LD_LIBRARY_PATH for setting the env variables for libraries to be loaded at runtime. I am getting this error while running. ImportError: /home/tomary/Python/2.6.1_x32/lib/python2.6/site-packages/lxml-2.2.6-py2.6-linux-x86_64.egg/lxml/etree.so: undefined symbol: xmlSchematronSetValidStructuredErrors It seems that this error occurs because the wrong version of libxml2 is getting loaded. Though I have set up the correct version in the right place at the front of LD_LIBRARY_PATH. Please help. Regards, Yogesh Tomar

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[lxml-dev] Newline while outputting a XML file.
by Lashkara Singh May 4, 2010

May 4, 2010

Hello everyone. I am developing a Python application that interprets/ writes XML files and I will be using lxml for this. However when writing to the XML using lxml, how can I force it to do a newline on every new tag? What I mean by this is, consider the following code: http://codepad.org/boEQxxqU The output of this code is: <html><head><title>Trying</title></head></html> I want the output to be: <html> <head> <title>Trying</title> </head> </html> Sorry if this question is too noobish, but I am just beginning.

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[lxml-dev] examine XSD xml schema
by Michael Konietzny May 2, 2010

May 2, 2010

Hello, I would like to examine a XSD schema in python. Currently I'm using lxml which is doing it's job very very well when it only has to validate a document against the schema. But, I want to know whats inside of the schema and access the elements in the lxml behavior. The schema: |<?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:include schemaLocation="worker_remote_base.xsd"/> <xsd:include schemaLocation="transactions_worker_responses.xsd"/> <xsd:include schemaLocation="transactions_worker_requests.xsd"/> </xsd:schema> | The lxml code to load the schema is (simplyfied): |xsd_file_handle= open( self._xsd_file, 'rb') xsd_text= xsd_file_handle.read() schema_document= etree.fromstring(xsd_text, base_url=xmlpath) xmlschema= etree.XMLSchema(schema_document) | I'm then able to use schema_document (which is etree._Element) to go through the schema as an XML document. But since etree.fromstring (at least it seams like that) expects a XML document the |xsd:include| elements are not processed. The problem is currently solved by parsing the first schema document, then load the include elements and then insert them one by one into the main document by hand: |BASE_URL= "/xml/" schema_document= etree.fromstring(xsd_text, base_url=BASE_URL) tree= schema_document.getroottree() schemas= [] for schemaChildin schema_document.iterchildren(): if schemaChild.tag.endswith("include"): try: h= open(os.path.join(BASE_URL, schemaChild.get("schemaLocation")), "r") s= etree.fromstring(h.read(), base_url=BASE_URL) schemas.append(s) except Exception as ex: print "failed to load schema: %s" % ex finally: h.close() # remove the<xsd:include ...> element self._schema_document.remove(schemaChild) for sin schemas: # inside<schema> for sChildin s: schema_document.append(sChild) | What I'm asking for is an idea how to solve the problem by using a more common way. I've already searched for other schema parsers in python but for now there was nothing that would fit in that case. Greetings, Michael

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[lxml-dev] Adding internal DTD entities?
by Brad Smith May 1, 2010

May 1, 2010

Hello all, First, thanks to those responsible for lxml, it has made processing xml in python an almost-fun experience! ;) I have only found one thing I need to be able to do, but of which I can't seem to find any examples. I have entities defined in a file that is shared by all of the files in a document (which are xi:include'ed into the main doc). Thus, I want each document to begin with something like: <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ <!ENTITY % common_entities SYSTEM "common.ent" > %common_entities; ]> The problem is that some of the files in the doc are auto-generated by a python/lxml pre-processing script, and I can't figure out how to have lxml insert that entity definition into the doctype declaration. Any suggestions here would be greatly appreciated. Thanks! --Brad

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