Using Shape Expressions is a great way to improve data on #Wikidata. However, the process of authoring such a shape expression is a great way of understanding how concepts are modelled on #Wikidata. (a thread) >>
To understand how items also covered by the #diseaseOntology I started the following EntitySchema: wikidata.org/wiki/EntitySch…
After running that EntitySchema on all Wikidata items that contain the Wikidata property Disease Ontology ID (P699) I got the following report 
A frightening number of "issues", however, further inspection revealed some inaccuracies in the EntitySchema. Updating those in iterative steps, lead to more manageable numbers.
Those iterative updates/downgrades are nicely rendered in the MediaWiki history report: wikidata.org/w/index.php?ti…
There are two conclusions: 1. Authoring Shape Expressions is an iterative process. 2. Reported issues might not be always caused by errors in the data, but they can also be caused by incomplete EntitySchemas
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