A Graphical XML Query Language
نویسندگان
چکیده
The structure of aX GLquery consists of two parts: one querying and one constructing XML data graphs. The querying part is defined by means of a simplified form of graph grammar, which is made user-friendly by adding some syntactic simplifications to standard graph grammars. The constructing part is defined by a graph which describes the structure and the content of the document which has to be created. The querying and constructing parts are correlated by means of variables, which are defined in the querying part (where it is specified what kind of information each variable identifies) and then used in the constructing part (where variables refer to the extracted information). In the extraction of graphs, graph grammars are coupled with first order formulas on such variables, in order to express conditions on data and filter them. In particular, every production rule is associated to a (possibly empty) first order formula which states under which conditions (regarding the data contained in the source graph) the rule can be applied.
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