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User:Malore/Wikidata structure/Item constraint

Types of item constraintsEdit

  • single value constraint - members of the subject type shouldn't have more than one value for the object property
  • multiple values constraint - members of the subject type shouldn't have more than one value for the object property
  • EX: all instances/subclasses of cross-platform (Q174666) should have a platform (P400) property with multiple values.
  • member requires statement
  • EX: all instances/subclasses of quantum particle (Q28693603) should have a spin quantum number (P1122) property;
  • EX: all instances/subclasses of Windows software (Q15593630) should have a operating system (P306) property with an instance/subclass of Microsoft Windows (Q1406) as value;

ADVANTAGESEdit

  • inherit properties from work to editions (how to do it?);
  • substitute "union of";
  • substitute "disjoint union of" with "one of constraint";
  • distinguish primary items (e.g. software) from derived ones (e.g. Windows software is derived from subclass of (P279) Q software (Q7397) and operating system (P306) Q1406 {{{3}}}