ext_Extension (containerproperties.ExtensionNodeProperty) comparison is not as expected

[a-kleinf]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

The comparison of ext_Extension (instance of etree.Element) is not as expected.

When comparing two different instances of etree.Element the included data is not compared but it is checked that both instances are the same object.
This leads to a wrong comparison of ext_Extension attributes.

Expected Behavior

When comparing two different instances of ext_Extension attributes, the included data shall be evaluated.

Minimal Reproducible Example

from lxml import etree
from sdc11073.definitions_sdc import SDC_v1_Definitions
from sdc11073 import pmtypes

ident_xml = b"""
<pm:Identification xmlns:pm="http://standards.ieee.org/downloads/11073/11073-10207-2017/participant"
                   Root="urn:uuid:90beab82-f160-4e2f-b3b2-ed8cfcf5e205"
                   Extension="123.234.424">
    <ext:Extension xmlns:ext="http://standards.ieee.org/downloads/11073/11073-10207-2017/extension">
        <foo someattr="somevalue"/>
        <bar anotherattr="differentvalue"/>
    </ext:Extension>
</pm:Identification>
"""
ident_xml_normalized = SDC_v1_Definitions.normalizeXMLText(ident_xml)
inst1 = pmtypes.InstanceIdentifier.fromNode(etree.fromstring(ident_xml_normalized))
inst2 = pmtypes.InstanceIdentifier.fromNode(etree.fromstring(ident_xml_normalized))

print(f"{inst1.ext_Extension == inst1.ext_Extension = }")
print(f"{inst2.ext_Extension == inst2.ext_Extension = }")

print(f"{inst1.ext_Extension == inst2.ext_Extension = } ????????? NOT EXPECTED ?????????")
print(f"{etree.tostring(inst1.ext_Extension) == etree.tostring(inst2.ext_Extension) = } !!!!!!!!")

print("Extension 1: " + str(etree.tostring(inst1.ext_Extension)))
print("Extension 2: " + str(etree.tostring(inst2.ext_Extension)))

OUTPUT:

inst1.ext_Extension == inst1.ext_Extension = True
inst2.ext_Extension == inst2.ext_Extension = True

inst1.ext_Extension == inst2.ext_Extension = False ????????? NOT EXPECTED ?????????
etree.tostring(inst1.ext_Extension) == etree.tostring(inst2.ext_Extension) = True !!!!!!!!

Extension 1: b'<ext:Extension xmlns:ext="ExtensionPoint" xmlns:pm="BICEPS_ParticipantModel">\n \n \n </ext:Extension>\n'
Extension 2: b'<ext:Extension xmlns:ext="ExtensionPoint" xmlns:pm="BICEPS_ParticipantModel">\n \n \n </ext:Extension>\n'

Solution proposal

No response

Python Version

3.9

Operating system

Windows

Sdc11073 Version

1.1.28

Link to sdc11073 Logs

No response

Further Information

No response

Participation

• I am willing to submit a pull request to fix this bug.

[a-kleinf]

similar bug was reported for the xml python library: https://bugs.python.org/issue37792

[leon1995]

this also affects version 2

[leon1995]

similar bug was reported for the xml python library: https://bugs.python.org/issue37792

yeah, this is a problem in lxml, as

etree.fromstring(ident_xml) == etree.fromstring(ident_xml)

also returns False

[leon1995]

requires fix for v1