PYTHON : XQuery library under Python

If you're looking to work with XQuery in Python, there are a few libraries and options you can consider:

1. Saxon-HE

Saxon-HE is a popular XSLT and XQuery processor that can be used from Python via subprocess calls. You can run XQuery scripts directly and capture the output.

Installation:

You can download Saxon-HE from the Saxon website.

Example:

import subprocess

def run_xquery(query):
    result = subprocess.run(['java', '-jar', 'saxon-he-10.6.jar', '-s:input.xml', '-xsl:script.xql'], 
                            input=query.encode(), capture_output=True, text=True)
    return result.stdout

xquery_script = "let $x := //example return $x"
output = run_xquery(xquery_script)
print(output)

2. PyXQuery

PyXQuery is a Python library for executing XQuery expressions. It provides a simple interface to work with XQuery.

Installation:

You can install it via pip:

pip install pyxquery

Example:

from pyxquery import PyXQuery

xq = PyXQuery('input.xml')
result = xq.execute('let $x := //example return $x')
print(result)

3. lxml

While not a direct XQuery library, lxml supports XPath, which is a subset of XQuery. It can be useful for querying XML documents.

Installation:

pip install lxml

Example:

from lxml import etree

tree = etree.parse('input.xml')
result = tree.xpath('//example')
for elem in result:
    print(elem.text)

Conclusion

Choose the library that best fits your needs based on your project's requirements. Saxon-HE is powerful for full XQuery support, while PyXQuery offers a Pythonic way to execute queries, and lxml is great for simpler XML manipulations.