Amara 2.0. Amara XML toolkit is an open-source collection of Python tools for XML processing, not just tools that happen to be written in Python, but tools built from the ground up to use Python idioms and take advantage of the many advantages of Python over other programming languages.
Home Page: http://wiki.xml3k.org/Amara2
License: Apache License 2.0
Below are the contents of files test.py and test.xsl. The script (test.py) works with python 2.6 installed on RHEL5 but it doesn't work on RHEL4 with python 2.6.
from amara.xslt import transform
html = '
Hello World
'<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:html="http://www.w3.org/1999/xhtml"
xmlns:fn="http://www.w3.org/2005/xpath-functions">
<xsl:output omit-xml-declaration="yes" indent="yes"
encoding="ISO-8859-1"/>
<xsl:template name="decode">
<xsl:variable name="c1" select="string('Hello Pankaj')"/>
<xsl:value-of select="$c1"/>
/xsl:template
<xsl:template match="p">
xsl:copy
<xsl:call-template name="decode"/>
/xsl:copy
/xsl:template
<xsl:template match="@|node()">
xsl:copy
<xsl:apply-templates select="@|node()"/>
/xsl:copy
/xsl:template
/xsl:stylesheet
When I use xpath replace like this
<xsl:value-of select="replace('Hello World', 'l', 'z')"/>
it says:
Extension functions must have a prefix
When I hit an error in an XSL transform, amara triggers a KeyError while attempting to handle the error, giving the following traceback:
File "/Library/Python/2.6/site-packages/amara/xslt/tree/attribute_types.py", line 457, in prepare
col=element.columnNumber, msg=str(error))
File "/Library/Python/2.6/site-packages/amara/init.py", line 29, in init
message %= kwds
KeyError: 'text'
Pretty simple. I tried to do the following:
import amara
RDFA11_EXAMPLE = """\
<div vocab="http://schema.org/"
typeof="Person">
<span property="name">Manu Sporny</span>
<img rel="image" src="manu.jpg" />
<span property="jobTitle">CEO</span>
<div rel="address">
<span property="streetAddress">
1700 Kraft Drive, Suite 2408
</span>
...
</div>
<a rel="url"
href="http://manu.sporny.org/">
manu.sporny.org
</a>
</div>
"""
doc = amara.parse(RDFA11_EXAMPLE)
doc.xml_select(u'//*[@property|@resource|@rel]')
Throws the following exception:
Traceback (most recent call last):
File "/tmp/foo.py", line 26, in <module>
doc.xml_select(u'//*[@property|@resource|@rel]')
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/util.py", line 52, in simple_evaluate
return ctx.evaluate(expr)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/__init__.py", line 224, in evaluate
return parsed.evaluate(self)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/__init__.py", line 65, in evaluate
return self.evaluate(context)
File "<ast-0>", line 0, in evaluate
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 161, in _boolean
if expr.evaluate_as_boolean(context):
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/__init__.py", line 70, in evaluate_as_boolean
self.compile_as_boolean(compiler)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 155, in compile_as_boolean
path.compile_as_boolean(compiler)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 78, in compile_as_boolean
return self._make_loop(compiler, found, empty)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 44, in _make_loop
for block in self._make_block(compiler):
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 24, in _make_block
'LOAD_ATTR', 'size',
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 41, in emit
for opname in instructions:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 159, in _boolean
for node in nodes:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 161, in _boolean
if expr.evaluate_as_boolean(context):
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/__init__.py", line 70, in evaluate_as_boolean
self.compile_as_boolean(compiler)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 155, in compile_as_boolean
path.compile_as_boolean(compiler)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 78, in compile_as_boolean
return self._make_loop(compiler, found, empty)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 44, in _make_loop
for block in self._make_block(compiler):
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/nodesets.py", line 24, in _make_block
'LOAD_ATTR', 'size',
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 41, in emit
for opname in instructions:
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/locationpaths/predicates.py", line 161, in _boolean
if expr.evaluate_as_boolean(context):
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/expressions/__init__.py", line 72, in evaluate_as_boolean
docstring=unicode(self))
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/__init__.py", line 45, in compile
firstlineno)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 60, in assemble
stacksize = self._compute_stack_size()
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 202, in _compute_stack_size
return walk(self.entry, 0, 0)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 192, in walk
maxsize = walk(instr.target, size, maxsize)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 198, in walk
maxsize = walk(block.next, size, maxsize)
File "/Users/uche/.local/lib/python2.7/site-packages/amara/xpath/compiler/assembler.py", line 187, in walk
raise RuntimeError("unhandled instruction: %r" % instr)
RuntimeError: unhandled instruction: <instr at 0x10b236940: opname='<block 1, offset 0>', oparg=None, target=None>
This only seems to happen when the union expression is used. You can do any of the following without the error:
doc.xml_select(u'//*[@property]')doc.xml_select(u'//*[@resource]')doc.xml_select(u'//*[@rel]')But any combination of 2 of the attributes in a union expression does trigger the exception.
Luis Miguel Morillas was struggling with this use-case a while back, and came up with sample code that makes it clear to me we need good, reusable examples.
I need to migrate to either pypy or python 3 after Jan 2020. Any ideas for a good migration path for a python2 project that uses akara and needs to be migrated?
See: http://groups.google.com/group/akara/browse_thread/thread/61c3dfdee4e9301b
An example template that causes the problem (with a sequence of very large files) is below. It uses pushtree to stream elements to structwriter
def main(..etc..):
..snip..
w = structwriter(indent=u"yes",stream=someStream)
feed = w.cofeed(
ROOT(
E_CURSOR(
(RDF.RDFNS, u'rdf:RDF'))))
handler = Handle(feed,..etc..)
@coroutine
def receive_nodes(..etc..):
while True:
node = yield
handler.handle(node..,..etc..)
return
target = receive_nodes(..etc..)
pushtree(doc, u'MedlineCitation', target.send,
entity_factory=entity_base)
handler.feed.close()
target.close()
return someStream.getvalue()
The traceback I receive (after a print statement in order to track which of the stylesheets in the import chain is currently being parsed) using a simple input document and running transform:
<?xml version='1.0'?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:import href="docbook-xsl-1.78.1/fo/docbook.xsl"/>
<xsl:attribute-set name="section.title.properties">
<xsl:attribute name="text-align">center/xsl:attribute
</xsl:attribute-set>
<xsl:attribute-set name="informaltable.properties">
<xsl:attribute name="font-size">8pt/xsl:attribute
<xsl:attribute name="width">100%/xsl:attribute
</xsl:attribute-set>
</xsl:stylesheet>
<amara.lib._inputsource._inputsource object at 0x102bfc6e0> file:///Users/chimezieogbuji/Projects/MetacognitionLLC/HomeHealthCare/stylus-eater-metacognition/hha-portal/docbook/docbook-xsl-1.78.1/common/pi.xsl
Traceback (most recent call last):
[..snip..]
File "/Library/Python/2.6/site-packages/amara/xslt/init.py", line 516, in transform
proc.append_transform(inputsource(transforms))
File "/Library/Python/2.6/site-packages/amara/xslt/processor.py", line 210, in append_transform
self.transform = self._reader.parse(source)
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 861, in parse
stylesheet = self._parseSrc(source, features, properties)
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 885, in _parseSrc
parser.parse(isrc)
File "lib/src/expat/sax_handler.c", line 306, in StartElement
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 456, in startElementNS
self._combine_stylesheet(instance, (local == 'import'))
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 687, in _combine_stylesheet
self.parse(new_source)
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 861, in parse
stylesheet = self._parseSrc(source, features, properties)
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 885, in _parseSrc
parser.parse(isrc)
File "lib/src/expat/sax_handler.c", line 306, in StartElement
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 456, in startElementNS
self._combine_stylesheet(instance, (local == 'import'))
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 687, in _combine_stylesheet
self.parse(new_source)
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 861, in parse
stylesheet = self._parseSrc(source, features, properties)
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 885, in _parseSrc
parser.parse(isrc)
File "lib/src/expat/sax_handler.c", line 306, in StartElement
File "/Library/Python/2.6/site-packages/amara/xslt/reader/init.py", line 426, in startElementNS
value = attr_info.prepare(instance, value)
File "/Library/Python/2.6/site-packages/amara/xslt/tree/attribute_types.py", line 485, in prepare
return parse_xpattern(value)
File "", line 1
error: syntax error at line 1, column 38: unexpected $undefined., expecting Literal or )
There are quite a few tickets in the old Trac system that are still open and relevant. We should migrate those here.
And also at:
(PWPYTHON)ubuntu@ip-10-85-141-174:~$ pip install amara
Requirement already satisfied (use --upgrade to upgrade): amara in ./PWPYTHON/lib/python2.7/site-packages
Downloading/unpacking 4Suite-XML>=1.0.2 (from amara)
Downloading 4Suite-XML-1.0.2.zip (2.2MB): 2.2MB downloaded
Running setup.py egg_info for package 4Suite-XML
Requirement already satisfied (use --upgrade to upgrade): python-dateutil in /usr/lib/python2.7/dist-packages (from amara)
Installing collected packages: 4Suite-XML
Running setup.py install for 4Suite-XML
Usage:
-c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
-c --help [cmd1 cmd2 ...]
-c cmd --help
-c --help-commands
-c --help-packages
error: option --single-version-externally-managed not recognized
Complete output from command /home/ubuntu/PWPYTHON/bin/python -c "import setuptools;__file__='/home/ubuntu/PWPYTHON/build/4Suite-XML/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-wplyzB-record/install-record.txt --single-version-externally-managed --install-headers /home/ubuntu/PWPYTHON/include/site/python2.7:
Usage:
-c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
-c --help [cmd1 cmd2 ...]
-c cmd --help
-c --help-commands
-c --help-packages
error: option --single-version-externally-managed not recognized
----------------------------------------
Cleaning up...
Command /home/ubuntu/PWPYTHON/bin/python -c "import setuptools;__file__='/home/ubuntu/PWPYTHON/build/4Suite-XML/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-wplyzB-record/install-record.txt --single-version-externally-managed --install-headers /home/ubuntu/PWPYTHON/include/site/python2.7 failed with error code 1 in /home/ubuntu/PWPYTHON/build/4Suite-XML
Storing complete log in /home/ubuntu/.pip/pip.log
This is what i get when i say pip install amara.
Does amara have any dependency on 4Suite-XML ?
We've known of security vulnerabilities dating from the 4Suite days, many of which are inherited from expat. We've closed some, but there are indications of more, including new ones discovered in our XSLT implementation. This ticket is a general placeholder for sound security review of amara.
WAX: http://java.ociweb.com/mark/programming/WAX.html (also ported to JavaScript). Looking at it, I think structwriter is cleaner, but some comparative examples and other analysis isn't a bad idea.
Amara includes logic to try to find and provide a JSON library, but it's not as well-studied as other alternatives such as AnyJSON and OmniJSON. The latter has the advantage of bundling Ippolito's simplejson for a built-in default. OmniJSON is also designed to be "vendorizable," meaning it should be easy to bundle in thirdparty, or we could also just include it in the setup.py prerequisites.
bindery.parse(...) leaks roughly 200x more memory than the size of the XML document that it's parsing. A 1KB document leaks about 200KB of RAM, which quickly adds up for long running processes performing repeated parsing.
In addition, each parse(...) call adds un-collectable objects to Python's variable reference tracking system, and adds O(1) CPU processing time overhead - perhaps because of the ever-growing reference-tracking load.
How to reproduce:
Python 2.7.6 (default, May 7 2014, 07:34:22)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gc
>>> len(gc.get_objects())
3803
>>> from amara import bindery
>>> len(gc.get_objects())
12113
>>> bindery.parse(open('test.xml'))
<entity at 0xb2ee60: 1 children>
>>> len(gc.get_objects())
12285
>>> bindery.parse(open('test.xml'))
<entity at 0xbed710: 1 children>
>>> len(gc.get_objects())
12832
>>> bindery.parse(open('test.xml'))
<entity at 0xbf6f80: 1 children>
>>> len(gc.get_objects())
12764
>>> bindery.parse(open('test.xml'))
<entity at 0xbf6050: 1 children>
>>> len(gc.get_objects())
13297
>>> bindery.parse(open('test.xml'))
<entity at 0xbf3830: 1 children>
>>> len(gc.get_objects())
13229
>>> bindery.parse(open('test.xml'))
<entity at 0xbf37a0: 1 children>
>>> len(gc.get_objects())
13762
>>> bindery.parse(open('test.xml'))
<entity at 0xcd60e0: 1 children>
>>> len(gc.get_objects())
13707
>>> bindery.parse(open('test.xml'))
<entity at 0xbf6050: 1 children>
>>> len(gc.get_objects())
14240Compare this to a well behaved parser:
Python 2.7.6 (default, May 7 2014, 07:34:22)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gc
>>> import xml.etree.cElementTree as ET
>>> len(gc.get_objects())
4289
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a0197b0>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019e10>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019990>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019ed0>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019870>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019a20>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019db0>
3849
>>> ET.parse(open('test.xml')).getroot(); len(gc.get_objects())
<Element '{http://www.w3.org/2005/Atom}feed' at 0x7fa03a019ae0>
3849
>>> I want to use the date xslt extension for some xml/xslt transformations but the implementation seems to be broken.
I use this test file to check if the date functions work:
from amara.xslt import transform
XML_DOC = """<?xml version="1.0"?>
<durations>
<duration>P4Y8MT7H</duration>
<duration>P17Y1MT2H</duration>
<duration>P1Y2MT2H</duration>
</durations>"""
XSL_STYLESHEET = """<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:date="http://exslt.org/dates-and-times">
<xsl:output method="html" omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/">
<out>
<datetime><xsl:value-of select="date:date-time()"/></datetime>
<date><xsl:value-of select="date:date('2000-01-02T03:04:05Z')"/></date>
<time><xsl:value-of select="date:time('2000-01-02T03:04:05Z')"/></time>
<year><xsl:value-of select="date:year('2000-01-02T03:04:05Z')"/></year>
<leapyear><xsl:value-of select="date:leap-year('2000-01-02T03:04:05Z')"/></leapyear>
<monthinyear><xsl:value-of select="date:month-in-year('2000-01-02T03:04:05Z')"/></monthinyear>
<monthname><xsl:value-of select="date:month-name('2000-01-02T03:04:05Z')"/></monthname>
<monthabbreviation><xsl:value-of select="date:month-abbreviation('2000-01-02T03:04:05Z')"/></monthabbreviation>
<weekinyear><xsl:value-of select="date:week-in-year('2000-01-02T03:04:05Z')"/></weekinyear>
<dayinyear><xsl:value-of select="date:day-in-year('2000-01-02T03:04:05Z')"/></dayinyear>
<dayinmonth><xsl:value-of select="date:day-in-month('2000-01-02T03:04:05Z')"/></dayinmonth>
<dayofweekinmonth><xsl:value-of select="date:day-of-week-in-month('2000-01-02T03:04:05Z')"/></dayofweekinmonth>
<dayinweek><xsl:value-of select="date:day-in-week('2000-01-02T03:04:05Z')"/></dayinweek>
<dayname><xsl:value-of select="date:day-name('2000-01-02T03:04:05Z')"/></dayname>
<dayabbreviation><xsl:value-of select="date:day-abbreviation('2000-01-02T03:04:05Z')"/></dayabbreviation>
<hourinday><xsl:value-of select="date:hour-in-day('2000-01-02T03:04:05Z')"/></hourinday>
<minuteinhour><xsl:value-of select="date:minute-in-hour('2000-01-02T03:04:05Z')"/></minuteinhour>
<secondinminute><xsl:value-of select="date:second-in-minute('2000-01-02T03:04:05Z')"/></secondinminute>
<formatdate><xsl:value-of select="date:format-date('2000-01-02T03:04:05Z', 'EEE, d MMM yyyy HH:mm:ss')"/></formatdate>
<weekinmonth><xsl:value-of select="date:week-in-month('2000-01-02T03:04:05Z')"/></weekinmonth>
<difference><xsl:value-of select="date:difference('2000-01-01T00:00:00Z', '2000-01-02T03:04:05Z')"/></difference>
<add><xsl:value-of select="date:add('2000-01-02T03:04:05Z', 'P1DT1H1M1S')"/></add>
<addduration><xsl:value-of select="date:add-duration('P4DT4H4M4S', 'P1DT2H3M4S')"/></addduration>
<sum><xsl:value-of select="date:sum(//duration)"/></sum>
<seconds><xsl:value-of select="date:seconds('2000-01-02T03:04:05Z')"/></seconds>
<duration><xsl:value-of select="date:duration('93784')"/></duration>
</out>
</xsl:template>
</xsl:stylesheet>"""
print transform(XML_DOC, XSL_STYLESHEET)Runing this file fails with a stack trace. It seems like the implementation in amara/xslt/exslt/datetime.py is broken (missing imports,...).
Did I do something wrong or can somebody else confirm this?
Well, the host is up, but your URL returns 404.
As reported by Mark Baker originally:
I observed a memory leak with a pushtree based parser I was writing, and reduced the problem [with a test program]. After letting it run for a little while in pdb, objgraph showed this;
(Pdb) objgraph.show_most_common_types(limit=5)
text 1476636
element 870756
comment 465962
tuple 12205
function 3119
from amara.pushtree import pushtree
def blah(r):
pass
data = open("bigfile.xml","r")
pushtree(data,'RECORD',blah)
For more info please see: https://foundry.zepheira.com/issues/1294
XPath last() function doesn't return the last item of a nodeset. When last() function is used in xpath expressions, the result is allways an empty nodeset.
See the test of the test suite:
<nodes>
<node>a</node>
<node>b</node>
<node>c</node>
</nodes>
>>> doc = amara.parse('dh_20000530_01.xml')
>>> doc.xml_select(u'/nodes/node[last()]')
nodeset()
>>> doc.xml_select(u'/nodes/node')
nodeset([<amara.tree.element at 0x236c2d0: name u'node', 0 namespaces, 0 attributes, 1 children>,
<amara.tree.element at 0x236c4d0: name u'node', 0 namespaces, 0 attributes, 1 children>,
<amara.tree.element at 0x236c9d0: name u'node', 0 namespaces, 0 attributes, 1 children>])
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