Talk:Q17339814
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Autodescription — group or class of chemical substances (Q17339814)
description: set of chemical substances that share a common characteristic
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group or class of chemical substances⟩ on wikidata tree visualisation (external tool)(depth=1) - Generic queries for classes
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subclass of group or class of physical objects[edit]
This is marked as a third-order class but is a subclass of group or class of physical objects (Q98119401). {{Q|98119401} is obviously a second-order class as its instances are classes of individuals. If this is a subclass of group or class of physical objects (Q98119401) then its instances are instances are also classes of individuals and thus it is a second-order class. Something has to be changed. Peter F. Patel-Schneider (talk) 23:15, 9 August 2023 (UTC)