Mailman 3 September 2009 - lxml - The Python XML Toolkit

[lxml-dev] lxml and libxslt-1.1.25
by Stefan Behnel 28 Sep '09

28 Sep '09

Hi all, there's a problem with lxml that shows when using libxslt 1.1.25. By accident, lxml uses an internal function from libxslt (xsltProcessOneNode) that wasn't declared in a public header file. The use of this function is related to XSLT extension elements. The problem didn't really show in earlier versions because the symbol was exported, so lxml could use it on most platforms - until it was declared "static" in libxslt 1.1.25. Daniel Veillard reacted quickly and decided to officially export this function starting from 1.1.26. So while you cannot build lxml with libxslt 1.1.25, it will work perfectly with the already released libxslt 1.1.26. Sorry for any inconvenience this may cause. Stefan

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[lxml-dev] Bug: Attribute names ignore their namespaces
by Marcello Perathoner 28 Sep '09

28 Sep '09

I want to delete the lang attribute from an html element that has both lang and xml:lang attributes. I found I cannot do that consistently. lxml deletes either lang or xml:lang at random. The results depend on the order the two attributes are specified in the html source. --- lxmlbug.py -------------------------------------- from lxml import etree html = etree.XML ("<html lang='en' xml:lang='en' />") del html.attrib['lang'] print etree.tostring (html) # prints expected: <html xml:lang="en"/> html = etree.XML ("<html xml:lang='en' lang='en' />") del html.attrib['lang'] print etree.tostring (html) # prints unexpected: <html lang="en"/> print print "lxml.etree: ", etree.LXML_VERSION print "libxml used: ", etree.LIBXML_VERSION print "libxml compiled: ", etree.LIBXML_COMPILED_VERSION print "libxslt used: ", etree.LIBXSLT_VERSION print "libxslt compiled: ", etree.LIBXSLT_COMPILED_VERSION ----------------------------------------------------------- $ python lxmlbug.py <html xml:lang="en"/> <html lang="en"/> lxml.etree: (2, 2, 2, 0) libxml used: (2, 7, 5) libxml compiled: (2, 7, 3) libxslt used: (1, 1, 26) libxslt compiled: (1, 1, 24) $ -- Marcello Perathoner webmaster(a)gutenberg.org

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[lxml-dev] Help with a problem
by Panos Lambrianides 21 Sep '09

21 Sep '09

Hello, I apologize up front if this is an issue that you have seen before. I spent quite of bit of time searching for a solution on google but could not find anything. I have the following problem. I am trying to do a very simple xpath search on an xml file as follows: Python 2.6 (r26:66714, Sep 21 2009, 17:48:26) [GCC 4.3.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import xml.etree.ElementTree as etree >>> f= open('out.xml','r') >>> tree = etree.parse(f) >>> tree.xpath('/form/input') Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: ElementTree instance has no attribute 'xpath' As you can see it complains that ElementTree has no xpath method associated with it. What am I missing here? I have lxml version 2.2.2 installed on Ubuntu 9.04 with python development version 2.6 and libsxlt version 1.1.25. On what may be relate importing etree gives the following error: >>> from lxml import etree Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: /usr/local/lib/python2.6/site-packages/lxml/etree.so: undefined symbol: xsltProcessOneNode >>> Thanks in advance for any help, -Panos

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Re: [lxml-dev] xpath problem
by Dinesh B Vadhia 18 Sep '09

18 Sep '09

oops! works perfectly now. thank-you. From: Chuck Bearden Sent: Friday, September 18, 2009 12:44 PM To: Dinesh B Vadhia Subject: Re: [lxml-dev] xpath problem On Fri, Sep 18, 2009 at 1:18 PM, Dinesh B Vadhia <dineshbvadhia(a)hotmail.com> wrote: > I'm having a problem withÂ xpath and here are the details: > > Xml fragment: > <head> > Â Â Â <docdata> > Â Â Â Â Â <identified-content> > Â Â Â Â Â Â Â <classifier class="indexing_service" type="descriptor">Ships and > Shipping</classifier> > > Xpath: > '/nitf/head/docdata/identifiedcontent/classifier[@class="indexing_service" > and @type="descriptor"]' > Code: > descriptors_list = tree.xpath('/nitf/head/docdata/identifiedcontent/classifier[@class="indexing_service" and @type="descriptor"]') Hi Dinesh, check your spelling. You have an element 'identified-content' in your fragment (which is lacking the 'nitf' element specified in the XPath, btw), but the XPath refers to 'identifiedcontent'. Chuck

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[lxml-dev] lxml.html does not support form.enctype
by Mary Lei 18 Sep '09

18 Sep '09

Looks like lxml.html does not provide access to form enctype. Any suggestions on how to get enctype from form? -- Mary Lei Software Testing IPAC-NExScl Rm: KS-233 MS: 220-6 Phone: 395-1998

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[lxml-dev] xpath problem
by Dinesh B Vadhia 18 Sep '09

18 Sep '09

I'm having a problem with xpath and here are the details: Xml fragment: <head> <docdata> <identified-content> <classifier class="indexing_service" type="descriptor">Ships and Shipping</classifier> Xpath: '/nitf/head/docdata/identifiedcontent/classifier[@class="indexing_service" and @type="descriptor"]' Code: descriptors_list = tree.xpath('/nitf/head/docdata/identifiedcontent/classifier[@class="indexing_service" and @type="descriptor"]') for descriptors_element in descriptors_list: print descriptors_element.tag, descriptors_element.text for child in descriptors_element.getchildren(): print child.tag, child.text But, the code isn't picking up the required text eg. 'Ships and Shipping'. Any ideas what is incorrect? Dinesh

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[lxml-dev] Question about schema validation
by Frank Millman 18 Sep '09

18 Sep '09

Hi all I am using both lxml (version 2.2.2) and XmlCopyEditor (XCE) to validate some instance documents against a schema. I have come across a situation where XCE reports an error, but lxml does not. AFAICT XCE is correct. Could this be a bug in lxml? Here is a snippet from the instance document - <resource id="regionalManager" name="Regional Manager"> <resourceParameter id="buyerName" isRequired="true" name="Buyer Name" type="xs:string"/> <resourceParameter id="region" isRequired="false" name="Region" type="xs:string"/> </resource> <resource id="departmentalReviewer" name="Departmental Reviewer"> <resourceParameter id="buyerName" isRequired="true" name="Buyer Name" type="xs:string"/> </resource> Here is the relevant section from the schema - <xsd:element name="resourceParameter" type="tResourceParameter"/> <xsd:complexType name="tResourceParameter"> <xsd:complexContent> <xsd:extension base="tBaseElement"> <xsd:attribute name="name" type="xsd:string"/> <xsd:attribute name="type" type="xsd:QName"/> <xsd:attribute name="isRequired" type="xsd:boolean"/> </xsd:extension> </xsd:complexContent> </xsd:complexType> <xsd:element name="baseElement" type="tBaseElement"/> <xsd:complexType name="tBaseElement" abstract="true"> <xsd:sequence> <xsd:element ref="documentation" minOccurs="0" maxOccurs="unbounded"/> <xsd:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence> <xsd:attribute name="id" type="xsd:ID" use="optional"/> <xsd:anyAttribute namespace="##other" processContents="lax"/> </xsd:complexType> The error message reported by XCE is 'ID buyerName is not unique'. Any thoughts? Frank Millman

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[lxml-dev] Python 3.1 binary on Windows?
by Philipp Reichmuth 15 Sep '09

15 Sep '09

Hi, maybe it's just me being stupid for overlooking something, but are there Windows binaries built for Python 3.1 out there? Philipp

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[lxml-dev] namespace inconsistency with attributes
by Uwe Hoffmann 14 Sep '09

14 Sep '09

hi, here is a python session showing a namespace inconsistency (from my point of view). It seems that a roundtrip (reading and saving a xml document ) is not possible with lxml under this circumstances. Maybe there is a misunderstanding on my side. user@workstation:~/tmp$ python Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18) [GCC 4.3.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import lxml.etree as et >>> eTree=et.fromstring("""<?xml version="1.0"?> ... <bla xmlns="urn:ns1" ... xmlns:o="urn:ns2" ... xmlns:ns1="urn:ns1" ... > ... <bluff ns1:val="abc"/> ... </bla> ... """) >>> bluff=eTree.findall("{urn:ns1}bluff")[0] >>> print bluff.attrib["{urn:ns1}val"] abc >>> bluff.attrib["{urn:ns1}val"]="def" >>> print bluff.attrib["{urn:ns1}val"] def >>> #so far everything went well >>> ts=et.tostring(eTree, xml_declaration=True, encoding="UTF-8") >>> print ts <?xml version='1.0' encoding='UTF-8'?> <bla xmlns="urn:ns1" xmlns:o="urn:ns2" xmlns:ns1="urn:ns1"> <bluff val="def"/> </bla> >>> # val="def" --> attribute namespace was >>> # lost because of default namespace ? >>> eTree=et.fromstring(ts) >>> bluff=eTree.findall("{urn:ns1}bluff")[0] >>> print bluff.attrib["{urn:ns1}val"] Traceback (most recent call last): File "<stdin>", line 1, in <module> File "lxml.etree.pyx", line 1893, in lxml.etree._Attrib.__getitem__ (src/lxml/lxml.etree.c:19259) KeyError: '{urn:ns1}val' >>> regards uwe hoffmann

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[lxml-dev] Problem installing lxml 2.2.2 for python 3.1
by Dov Reshef 14 Sep '09

14 Sep '09

Hi all I'm trying to install lxml 2.2.2 for python 3.1. (I'm using the egg for python version 3, simply unpacking it to the site-packages folder). However, when I try to use it in my code I get "ImportError: DLL load failed", which if I understand it correctly, means that it can't find the etree.dll even though it's right there in my site-packages folder (etree.pyd). Thanks Dave

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