Solution for issue #6024 results in schema invalid ruleset file

[henning-gerhardt]

Describe the bug
While discussion the issue #6024 a solution / work around was presented in comment. Using this workaround to prevent the issue #6024 will result in a schema invalid ruleset file:

$ xmllint --noout --schema rulesets/ruleset.xsd  rulesets/slub.xml
rulesets/slub.xml:2441: element restriction: Schemas validity error : Element '{http://names.kitodo.org/ruleset/v2}restriction', attribute 'division': '' is not a valid value of the atomic type 'xs:NMTOKEN'

The file slub.xml has the content in the mentioned line

    <correlation>
        <restriction division="" unspecified="forbidden">
            <!-- This is necessary to avoid the creation of a second dmdSec https://github.com/kitodo/kitodo-production/issues/6024 -->
            <permit division="page"/>
        </restriction>

The error message above will appear with the ruleset.xsd file from release 3.6.x, 3.7.x and current master.

To Reproduce
Steps to reproduce the behavior:

1. Add the restriction entry like descripted in metadata "processTitle" creates an an additional <mets:dmdSec> for some document types #6024
2. Run a validation with the ruleset.xsd against the changed ruleset file.

Expected behavior
Even a workaround should not result in a schema invalid ruleset file. If a workaround even needs changes in the ruleset.xsd file then this file must be changed too.

Screenshots

Release

• 3.6.x
• 3.7.x
• current master (2024-08-27)