"Has improper value for" is a predefined property to track input errors for irregular value annotations that was likely caused by type or allowed value restrictions.
en:EAC-CPF - is an XML-Schema. It provides a grammar for encoding names of creators of archival materials and related information. EAC-CPF is an addition to EAD +
EAC-CPF - is an XML-Schema. It provides a grammar for encoding names of creators of archival materials and related information. EAC-CPF is an addition to EAD +