lxml - The Python XML Toolkit February 2015

lxml@python.org

14 participants
19 discussions

[lxml-dev] Reparenting a node
by Lawrence Oluyede 30 Jan '23

30 Jan '23

I have a doc A and a doc B, I'd like to put a node extracted from A in the document B but I always get a ValueError: ValueError: Element is not a child of this node. I didn't find any "setparent" in the API. How can I do this? -- Lawrence, oluyede.org - neropercaso.it "It is difficult to get a man to understand something when his salary depends on not understanding it" - Upton Sinclair

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[lxml-dev] Checking whether a node is a comment/element
by Geoffrey Sneddon 11 Jan '23

11 Jan '23

Hi, What's the best way to check whether a given node is a comment or an element? For the former, I'm currently using isinstance(node, etree._Comment), which is rather obviously sub-optimal. -- Geoffrey Sneddon <http://gsnedders.com/>

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[lxml-dev] lxml 2.0.5 released
by Stefan Behnel 11 Jan '23

11 Jan '23

Hi all, lxml 2.0.5 is on PyPI. This is a bug-fix-only release of the stable 2.0 series. Have fun, Stefan 2.0.5 (2008-05-01) Bugs fixed * Resolving to a filename in custom resolvers didn't work. * lxml did not honour libxslt's second error state "STOPPED", which let some XSLT errors pass silently. * Memory leak in Schematron with libxml2 >= 2.6.31.

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[lxml-dev] lxml has its page on launchpad
by Stefan Behnel 21 Sep '22

21 Sep '22

Hi all, I added the lxml project to launchpad, the Ubuntu Bug-Tracker. It also has a FAQ engine and a couple of other goodies. https://launchpad.net/lxml It's easy to sign up for launchpad, BTW, no 90%-footnotes-contract. Have fun, Stefan

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[lxml-dev] Building LXML Trunk
by Sidnei da Silva 31 Aug '22

31 Aug '22

Hi, I've tried to build lxml from trunk today, on Win32. Got the following error: src\lxml\etree.c(880) : error C2059: syntax error : ')' src\lxml\etree.c(881) : error C2059: syntax error : ')' src\lxml\etree.c(882) : error C2059: syntax error : ')' src\lxml\etree.c(883) : error C2059: syntax error : ')' Any clue? Smells like a Pyrex issue? -- Sidnei da Silva Enfold Systems http://enfoldsystems.com Fax +1 832 201 8856 Office +1 713 942 2377 Ext 214

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XML parsing and CDATA
by Jens Tröger 26 Mar '15

26 Mar '15

Hi, The following is based on this question here: http://stackoverflow.com/questions/28398651/how-to-generate-markup-inside-o… What I ended up using in my XSLT stylesheet was something along these lines: <xsl:attribute name="bla"> <![CDATA[Here is <em>some</em>verbatim text with id="]]> <xsl:value-of select="@id"/> <![CDATA[" and <strong>more</strong> stuff.]]> </xsl:attribute> This worked reliably. However, this worked only after a seemingly subtle fix to the text itself! Initially I had something like id-<xsl:value-of select="@id"/> i.e. there was some text before that <xsl:value>. This worked sometimes, but not others where suddenly the CDATA following that text/element combination was swallowed away. Removing any text around the <xsl:value> seems to work in all cases though. Unfortunately, the document is too large to send and I don't really have the time to build a small test case which illustrates this problem. But it seems to me that there is a parser issue here when multiple CDATA inside of the <xsl:attribute> were combined with text and another element like <xsl:value>. There was no error message, just garbled output. Cheers, Jens -- Jens Tröger http://savage.light-speed.de/

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Programmatically accessing schema
by Aaron Storm 28 Feb '15

28 Feb '15

I went through the documentation and couldn't find any hints on this. And I am not sure what keywords to search on google. Is there a way to programmatically (or api?) query the XSD for a specific element to get its spec? For example, I would like to know if /MyContainer/Container2 can be repeated. Or if /MyContainer/Container1/Item1/ text() is optional. my.xml```xml<?xml version="1.0" encoding="UTF-8"?><MyContainer xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="sample.xsd"> <Container1> <Item1>String</Item1> </Container1> <Container2> <Item2>2014-12-17T09:30:47Z</Item2> </Container2> <Container2> <Item2>2015-01-17T09:30:47Z</Item2> </Container2></MyContainer>``` sample.xsd```<?xml version="1.0" encoding="UTF-8"?><xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="MyContainer"> <xs:annotation> <xs:documentation>docs</xs:documentation> </xs:annotation> <xs:complexType> <xs:sequence> <xs:element name="Container1"> <xs:complexType> <xs:sequence> <xs:element minOccurs="0" name="Item1" type="xs:string"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element maxOccurs="unbounded" ref="Container2"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="Container2"> <xs:complexType> <xs:sequence> <xs:element name="Item2" type="xs:dateTime"/> </xs:sequence> </xs:complexType> </xs:element></xs:schema>``` cheers,Aaron

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Having all namespace declarations in the root element
by Gilles Lenfant 27 Feb '15

27 Feb '15

Hi, I made an XML doc grabbing and assembling nodes from various stuffs. namespace declarations are consistent but repeated among various descendant elements. And I want to gather all these namespace declarations in the root element. i. e. when I have : <root> <foo xmlns:abc="abc.namespace"> <abc:bar attrib="value"> blah </abc:bar> </foo> <joe xmlns:abc="abc.namespace"> <abc:stuff> stuff </abc:stuff> </joe> </root> Then I need (once serialized with .tostring(...) : <root xmlns:abc="abc.namespace"> <foo> <abc:bar attrib="value"> blah </abc:bar> </foo> <joe> <abc:stuff> stuff </abc:stuff> </joe> </root> I naively thought that merging all elements .nsmap attribs into the root.nsmap should do the job, but it appears that changes to the Element.nsmap mapping fail silently. My code (what I want to do with a really mutable .nsmap) : ---- etree.cleanup_namespaces(doc) for elem in doc.getiterator(): if hasattr(elem, 'nsmap'): for k in elem.nsmap: doc.nsmap[k] = elem.nsmap.pop(k) ---- Unfortunately .nsmap attrib is a so called "non mutable dict but ignoring silently mutation attempts". Thus this code does not work as expected. Any hint to unlock me is welcome. Best regards -- Gilles Lenfant

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a 'tail' problem
by Martin Mueller 27 Feb '15

27 Feb '15

I have a "tail" problem with the following XML fragment <lg> <l>WHo doth desire the trump of fame, to sound vnto the Skies,</l> <l><pb/>Or els who seekes the holy place, where mighty Ioue he lies,</l> <l>He must not by deceitfull mind, nor yet by puissant strength,</l> </lg> I want to turn the <pb> tag from child to previous sibling of <l> and use this code for element in tree.iter(): if element.tag == 'pb': parent = element.getparent() grandparent = parent.getparent() position = grandparent.index(parent) parent.text = element.tail grandparent.insert(position , (element)) Some of it works but it fails to get rid of the pb tail and produces this output: <lg> <l>WHo doth desire the trump of same, to sound vnto the skies,</l> <pb/>Or els who seekes the holy place, where mighty Ioue he lies, <l>Or els who seekes the holy place, where mighty Ioue he lies,</l> <l>He must not by deceitfull mind, nor yet by puissant strength,</l> </lg> If there is a with_tail=False solution, I don't know where to stick the command. Martin Mueller Professor emeritus of English and Classics Northwestern University

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Isoschematron.Schematron not working as expected
by Pierpaolo Da Fieno 27 Feb '15

27 Feb '15

Hallo everyone, while working on a ISO Schematron validation routine, I noticed that reporting, even if triggered correctly, was not generating a False value. If check the validation_report, the report element is being triggered correctly but the final result is True and the error_log is empty. Finally I went back to a very simple example included in isoschematron.Schematron docstring: >>> from lxml import isoschematron >>> schematron = isoschematron.Schematron(etree.XML(''' ... <schema xmlns="http://purl.oclc.org/dsdl/schematron" > ... <pattern id="id_only_attribute"> ... <title>id is the only permitted attribute name</title> ... <rule context="*"> ... <report test="@*[not(name()='id')]">Attribute ... <name path="@*[not(name()='id')]"/> is forbidden<name/> ... </report> ... </rule> ... </pattern> ... </schema> ... ''')) >>> xml = etree.XML(''' ... <AAA name="aaa"> ... <BBB id="bbb"/> ... <CCC color="ccc"/> ... </AAA> ... ''') >>> schematron.validate(xml) 0 >>> xml = etree.XML(''' ... <AAA id="aaa"> ... <BBB id="bbb"/> ... <CCC/> ... </AAA> ... ''') >>> schematron.validate(xml) 1 Now if I run the above code I always get True, even with the invalid xml input. Same situation: validation_report is correct, but return value is True and error_log is empty. I'm running python 3.4.1 with lxml 3.5dev0. Same result with lxml 3.4.2. Am I doing something horribly wrong without realizing or is there actually a bug here? Best Regards Pierpaolo Da Fieno

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lxml - The Python XML Toolkit February 2015