| http://www.w3.org/ns/prov#value | - The "ignoreUnknown" property set to "true" denotes that the service accepts without faulting additional _unexpected items_ in messages sent to that service. _Unexpected items_ are attributes and elements not defined by the schema for a particular element in the input message. _Unexpected items_ may appear in any namespace including the targetNamespace of a known schema, as we
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