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The namespace URI http://www.w3.org/2001/XMLSchema# that is based on the SMW-import-page MediaWiki:Smw import xsd (used, e.g. for RDF export) has no matching namespace prefix and namespace URI definition on the concept scheme page; please add one!

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boolean: Boolean has the ·value space· required to support the mathematical concept of binary-valued logic: {true, false}.

Lexical representation: an instance of a datatype that is defined as ·boolean· can have the following legal literals {true, false, 1, 0}.

Canonical representation: the canonical representation for boolean is the set of literals {true, false}. XSD datatype term