| http://www.w3.org/ns/prov#value | - The "ignoreUnknown" property set to "true" indicates that a processor should not fault when processing messages that contain _unexpected items_. _Unexpected items_ are attributes and elements not defined by the schema for a particular element. _Unexpected items_ may appear in any namespace including the targetNamespace of a known schema, as well as in a namespace for which no
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