[WIP] Fix incorrect SPARQL translation for OWLDataSomeValuesFrom

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Incorrect SPARQL translation for OWLDataSomeValuesFrom with rdfs:Literal</issue_title>
<issue_description>When converting the following OWL class expression:

((CONTEXT_POSITION_MARKER ⊓ ∃mouse_lymph.Literal) ⊓ ¬∃salmonella.Literal)

the converter produces incorrect SPARQL:

?pos a <http://owlapy.internal/CONTEXT_POSITION_MARKER> . ?pos <http://dl-learner.org/carcinogenesis#mouse_lymph> ?s_1 . ?pos ?s_2 ?s_3 . FILTER NOT EXISTS { ?pos <http://dl-learner.org/carcinogenesis#salmonella> ?s_4 . }

which is clearly wrong, to recreate the pronblem please use this test case:

main.py</issue_description>

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