get role-description and arcrole-description from object's parent model

This pr tries to resolve #8

Issue

Attributes .role-description and .description not returning the correct value for roles of a taxonomy loaded as a second taxonomy using taxonomy(...) in the rule (after an initial taxonomy was loaded), indicating that the values for these attritbutes are being retrieved from the initial taxonomy loaded only, resulting in incorrect value or incorect none value.

Reason for the issue

In XuleProperties.py, functions property_role, property_role_uri, property_arcrole, passes xule_context.model to role_uri_to_model_role and arcrole_uri_to_model_role. The xule_context.model does not seem to be updated to reflect the modelXbrl in the current scope, the functions always pass the initially loaded modelXbrl, which is fine until a new taxonomy is loaded via taxonomy(...) then the model passed must be the correct model for the current scope.

Suggested Changes

Get the correct modelXbrl from the model object itself before passing it to the conversion functions. This relys on Arelle Cntlr keeping track of which object relates to which parent model, which is very reliable in my experience.

You may want to keep track of the model in scope another way, this is why this is a draft pr just to pinpoint the issue.

Testing

Same as in issue #8, check for a role that exists only in ESEF 2021 loaded using taxonomy(...) after initially loading ESEF 2019.

Steps to test

Before applying the changes in this pr Save following rule to file test.xule:

constant $other_taxonomy_networks = taxonomy('http://www.esma.europa.eu/taxonomy/2021-03-24/esef_all.xsd')
                                        .networks(none, "http://www.esma.europa.eu/xbrl/role/all/ifrs_17_role-836600o")

output get-from-network-level
for ($nw in $other_taxonomy_networks)
        dict(
        list("Role", $nw.role),
        list("Role description Network attr", $nw.role-description),
        list("Role description (Role attr)", $nw.role.description)
        ) /* Just to print it out in a readable format*/

output get-from-networks-level
list("\nRole description (Networks attr): {string($other_taxonomy_networks.role-description.to-set())}\n---------------\n")[1]

Run using the following command (loads ESEF 2019)

$ arelleCmdLine --plugins xule -f http://www.esma.europa.eu/taxonomy/2019-03-27/esef_all.xsd --internetRecheck never --xule-run --xule-compile test.xule --xule-rule-set test.xule.zip --logFormat "%(message)s"

The role description is not detected, the ouput should be as follows:

{'Role': <xule.XuleValue.XuleRole object at 0x7f38aa9790a0>,
 'Role description (Role attr)': None,
 'Role description Network attr': None}
{'Role': <xule.XuleValue.XuleRole object at 0x7f38aa979790>,
 'Role description (Role attr)': None,
 'Role description Network attr': None}
{'Role': <xule.XuleValue.XuleRole object at 0x7f38aa979d30>,
 'Role description (Role attr)': None,
 'Role description Network attr': None}
{'Role': <xule.XuleValue.XuleRole object at 0x7f38aa988310>,
 'Role description (Role attr)': None,
 'Role description Network attr': None}

Role description (Networks attr): set(None)

After applying the changes in this pr Run the same exact test above, the role description is detected and the output should be as follows:

{'Role': modelRoleType[126944, uri: http://www.esma.europa.eu/xbrl/role/all/ifrs_17_role-836600o, definition: [836600o] Notes - Insurance contracts (IFRS 17), esef_all.xsd line 804]),
 'Role description (Role attr)': '[836600o] Notes - Insurance contracts (IFRS '
                                 '17)',
 'Role description Network attr': '[836600o] Notes - Insurance contracts (IFRS '
                                  '17)'}
{'Role': modelRoleType[126944, uri: http://www.esma.europa.eu/xbrl/role/all/ifrs_17_role-836600o, definition: [836600o] Notes - Insurance contracts (IFRS 17), esef_all.xsd line 804]),
 'Role description (Role attr)': '[836600o] Notes - Insurance contracts (IFRS '
                                 '17)',
 'Role description Network attr': '[836600o] Notes - Insurance contracts (IFRS '
                                  '17)'}
{'Role': modelRoleType[126944, uri: http://www.esma.europa.eu/xbrl/role/all/ifrs_17_role-836600o, definition: [836600o] Notes - Insurance contracts (IFRS 17), esef_all.xsd line 804]),
 'Role description (Role attr)': '[836600o] Notes - Insurance contracts (IFRS '
                                 '17)',
 'Role description Network attr': '[836600o] Notes - Insurance contracts (IFRS '
                                  '17)'}
{'Role': modelRoleType[126944, uri: http://www.esma.europa.eu/xbrl/role/all/ifrs_17_role-836600o, definition: [836600o] Notes - Insurance contracts (IFRS 17), esef_all.xsd line 804]),
 'Role description (Role attr)': '[836600o] Notes - Insurance contracts (IFRS '
                                 '17)',
 'Role description Network attr': '[836600o] Notes - Insurance contracts (IFRS '
                                  '17)'}

Role description (Networks attr): set([836600o] Notes - Insurance contracts (IFRS 17))
---------------

xbrlus / xule