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SQL4X: A Flexible Query Language for XML and Relational Databases [chapter]

Sara Cohen, Yaron Kanza, Yehoshua Sagiv
2002 Lecture Notes in Computer Science  
SQL4X, a powerful language for simultaneously querying both relational and XML databases is presented. Using SQL4X, one can create both relations and XML documents as query results.  ...  Thus, SQL4X can be thought of as an integration language. In order to allow easy integration of XML documents with varied structures, SQL4X uses flexible semantics when querying XML.  ...  XQuery, on the other hand, is a new language designed specifically for XML and probably will not be implemented in a relational database system.  ... 
doi:10.1007/3-540-46093-4_16 fatcat:mk7dwida3vho7jzislk4vpffkq