Functional Dependencies for Semistructured Data
Extended functional dependencies; Path functional dependencies
Functional dependencies are used in relational database design to show that the value of a set of attributes depends on the value of another set of attributes. Theory has been developed to manipulate a set of functional dependencies to describe equivalences of sets of functional dependencies. Semi-structured data differs from relational data in two important ways: semi-structured data is hierarchical and the structure of the data is less consistent. Traditional functional dependencies do not capture these differences so new functional dependencies with associated theory has been defined for semi-structured data.