Saxon » SaxonC

The setLanguageVersion method is available on the XPathProcessor for the C++ and PHP APIs but is missing from the Python API.

As a workaround in Python API user can set the language as follows:

xpath_processor.set_property("lang:", "4.0")

I find this is not working in SaxonC EE 12.4.2, code like

from saxoncee import PySaxonProcessor, PySaxonApiError

with PySaxonProcessor(license=True) as saxon_proc:
    print(saxon_proc.version)

    xpath_proc = saxon_proc.new_xpath_processor()

    xpath_proc.set_language_version('4.0')

    try:
        print(xpath_proc.evaluate('(1 to 5)=!>fn{. + .}()'))
    except PySaxonApiError as e:
        print(e)

    try:
        print(xpath_proc.evaluate('parse-html("<p>Test.<p>Test")'))
    except PySaxonApiError as e:
        print(e)

gives

SaxonC-EE 12.4.2 from Saxonica
XPST0003: The parser is not configured to allow use of XPath 4.0 syntax. Line number: -1
XPST0017: Cannot find a 1-argument function named Q{http://www.w3.org/2005/xpath-functions}parse-html(). Line number: -1

as does the workaround:

from saxoncee import PySaxonProcessor, PySaxonApiError

with PySaxonProcessor(license=True) as saxon_proc:
    print(saxon_proc.version)

    xpath_proc = saxon_proc.new_xpath_processor()

    xpath_proc.set_property('lang:', '4.0')

    try:
        print(xpath_proc.evaluate('(1 to 5)=!>fn{. + .}()'))
    except PySaxonApiError as e:
        print(e)

    try:
        print(xpath_proc.evaluate('parse-html("<p>Test.<p>Test")'))
    except PySaxonApiError as e:
        print(e)

I haven't been able to identify so far whether this is a regression or whether it never worked for the Python XPath API.

So looking at https://saxonica.plan.io/projects/saxonmirrorhe/repository/he/revisions/he_mirror_saxon_12_4_2/entry/src/main/java/net/sf/saxon/option/cpp/XPathProcessor.java#L417 which does

        if (parameterMap.containsKey("lang:")) {

and https://saxonica.plan.io/projects/saxonmirrorhe/repository/he/revisions/he_mirror_saxon_12_4_2/entry/src/main/java/net/sf/saxon/option/cpp/XPathProcessor.java#L418 which does

            valuei = (String) parameterMap.get("lang");

I wonder whether the second line should do

            valuei = (String) parameterMap.get("lang:");

instead?

Yes that is the problem.

And because of comment #7 the following hack/workaround works for me:

    xpath_proc.set_property('lang:', '4.0')
    xpath_proc.set_property('lang', '4.0')

Oh, yes, that is smart thinking.

Nevertheless I hope you reopen this bug and fix it for the next maintenance release.