Source code for astropy.utils.xml.validate

# Licensed under a 3-clause BSD style license - see LICENSE.rst

Functions to do XML schema and DTD validation.  At the moment, this
makes a subprocess call to xmllint.  This could use a Python-based
library at some point in the future, if something appropriate could be

import os
import subprocess

[docs] def validate_schema(filename, schema_file): """ Validates an XML file against a schema or DTD. Parameters ---------- filename : str The path to the XML file to validate schema_file : str The path to the XML schema or DTD Returns ------- returncode, stdout, stderr : int, str, str Returns the returncode from xmllint and the stdout and stderr as strings """ base, ext = os.path.splitext(schema_file) if ext == ".xsd": schema_part = "--schema" elif ext == ".dtd": schema_part = "--dtdvalid" else: raise TypeError("schema_file must be a path to an XML Schema or DTD") p = subprocess.Popen( ["xmllint", "--noout", "--nonet", schema_part, schema_file, filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE, ) stdout, stderr = p.communicate() if p.returncode == 127: raise OSError("xmllint not found, so can not validate schema") elif p.returncode < 0: from astropy.utils.misc import signal_number_to_name raise OSError( f"xmllint was terminated by signal '{signal_number_to_name(-p.returncode)}'" ) return p.returncode, stdout, stderr