def _get_target_namespace(xml_schema):
"""Get the target namespace.
Args:
xml_schema: XML representation of the schema.
Returns:
The target namespace.
"""
try:
xsd_tree = XSDTree.transform_to_xml(xml_schema)
except Exception as e:
raise exceptions.XMLError(str(e))
root = xsd_tree.find(".")
if "targetNamespace" in root.attrib:
target_namespace = root.attrib["targetNamespace"]
if target_namespace not in list(root.nsmap.values()):
message = "The use of a targetNamespace without an associated prefix is not supported."
raise oai_pmh_exceptions.OAIAPILabelledException(
message=message, status_code=status.HTTP_400_BAD_REQUEST)
else:
target_namespace = "http://www.w3.org/2001/XMLSchema"
return target_namespace
def fromstring(xml_string):
""" Convert a string to an XML tree
Args:
xml_string:
Returns:
"""
try:
return etree.fromstring(xml_string)
except Exception as e:
raise exceptions.XMLError(e.message)
def tostring(xml_tree, pretty=False):
""" Return an XML String from a lxml etree
Args:
xml_tree:
pretty:
Returns:
"""
try:
return etree.tostring(xml_tree, pretty_print=pretty)
except Exception as e:
raise exceptions.XMLError(e.message)
def get_extension(xml_tree):
""" Returns the extension file from a parsed xml
Args:
xml_tree: result of build_tree
Returns:
"""
try:
return xml_tree.find("//xsl:output",
namespaces={'xsl': xml_constants.XSL_NAMESPACE}).attrib['method']
except Exception as e:
raise exceptions.XMLError(e.message)
def fromstring(xml_string, parser=None):
""" Convert a string to an XML tree
Args:
xml_string:
parser:
Returns:
"""
try:
return etree.fromstring(xml_string, parser=parser)
except Exception as e:
raise exceptions.XMLError(str(e))
def tostring(xml_tree, pretty=False):
"""Return an XML String from a lxml etree
Args:
xml_tree:
pretty:
Returns:
"""
try:
return etree.tostring(xml_tree, pretty_print=pretty, encoding="unicode")
except Exception as e:
raise exceptions.XMLError(str(e))
def iterfind(xml_string, match):
""" Finds all matching sub elements, by tag name or path.
Args:
xml_string: String xml.
match: Pattern to match
Returns:
An iterable yielding all matching elements in document order.
"""
try:
xml_tree = XSDTree.build_tree(xml_string)
return xml_tree.iterfind(match)
except Exception as e:
raise exceptions.XMLError(e.message)
def iterparse(xml_string, events):
""" Returns etree.iterparse
Args:
xml_string:
events:
Returns:
"""
try:
xml_file = BytesIO(str(xml_string))
return etree.iterparse(xml_file, events)
except Exception as e:
raise exceptions.XMLError(e.message)
def iterparse(xml_string, events):
""" Returns etree.iterparse
Args:
xml_string:
events:
Returns:
"""
try:
xml_file = BytesIO(xml_string.encode('utf-8'))
return etree.iterparse(xml_file, events)
except Exception as e:
raise exceptions.XMLError(str(e))
def fromstring(xml_string, parser=None):
"""Convert a string to an XML tree
Args:
xml_string:
parser:
Returns:
"""
if not parser:
parser = XMLParser(remove_blank_text=True)
try:
return etree.fromstring(xml_string, parser=parser)
except Exception as e:
raise exceptions.XMLError(str(e))