def add_iso_md_element(xml_obj: _Element, new_link: str):
""" Adds a new MetadataURL element to the parent xml_obj
Args:
xml_obj (_Element): The parent xml object which holds all MetadataURL elements
new_link (str): The link of the new metadata resource
Returns:
nothing
"""
iso_elem = etree.Element("MetadataURL", {"type": "ISO19115:2003"},
nsmap={"xlink": "http://www.w3.org/1999/xlink"})
iso_elem_format = etree.SubElement(iso_elem, "Format")
iso_elem_format.text = "text/xml"
iso_elem_resource = etree.SubElement(
iso_elem, "OnlineResource", {
"{http://www.w3.org/1999/xlink}type": "simple",
"{http://www.w3.org/1999/xlink}href": new_link
})
# try to append where other metadaURL elements might already exist
# if there are no other elements -> just append it at the end
other_iso_md_elements = try_get_element_from_xml("./MetadataURL", xml_obj)
if len(other_iso_md_elements):
index = 0
for other_iso in other_iso_md_elements:
i = xml_obj.index(other_iso)
if i > index:
index = i
index += 1
xml_obj.insert(index, iso_elem)
else:
xml_obj.append(iso_elem)
def create_subelement(xml_elem: _Element, tag_name, after: str = None, attrib: dict = None, nsmap: dict = {}):
""" Creates a new xml element as a child of xml_elem with the name tag_name
Args:
xml_elem: The xml element
tag_name: The tag name for the new element
after (str): The tag name of the element after which the new one should be inserted
attrib: The attribute dict for the new element
Returns:
A new subelement of xml_elem
"""
ret_element = etree.Element(tag_name, attrib=attrib, nsmap=nsmap)
if after is not None:
after_element = try_get_single_element_from_xml("./{}".format(after), xml_elem)
after_element_index = xml_elem.index(after_element) + 1
xml_elem.insert(after_element_index, ret_element)
else:
xml_elem.append(ret_element)
return ret_element
def add_subelement(parent_elem: _Element, sub_element: _Element, after: str = None):
""" Adds an existing xml element after
Args:
parent_elem: The parent xml element
sub_element: The sub xml element
Returns:
parent_elem: The modified xml element, holding the subelement as a child
"""
if after is not None:
after_element = try_get_single_element_from_xml("./{}".format(after), parent_elem)
if after_element is None:
# If this element could not be found, we append this element at the end
after_element_index = -1
else:
after_element_index = parent_elem.index(after_element) + 1
parent_elem.insert(after_element_index, sub_element)
else:
parent_elem.append(sub_element)
return parent_elem
def _get_child_element_index(parent_ele: _Element, child_ele: _Element) -> int:
return parent_ele.index(child_ele)
