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In relational data model, two important referential integrity constraints is Inclusion Dependency (ID) and Foreign Key (FK). In last decade, with the growing use of XML as data representation and exchange format over the web, the issue of integrity constraints in XML has received great importance to the database community. In this paper, the authors propose XML Inclusion Dependency (XID) and XML Foreign Key (XFK). When proposing, they show how both XID and XFK can be defined over the Document Type Definition (DTD) and are satisfied by the XML documents. They introduce a novel concept tuple that produces semantically correct values in the XML documents when satisfactions are checked. They also show that XFK is defined with the combination of XID and XML Key.
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