US 6,934,712 B2 · Tagging XML query results over relational DBMSs

Abstract

A method for publishing relational data as XML by translating XML queries into queries against a relational database. Conversion of the relational database into an XML database is not required. Each relational table is mapped to a virtual XML document, and XML queries are issued over these virtual documents. An XML query is parsed and transformed into a language-neutral intermediate representation, which is a sequence of operations describing how the output document is derived from the underlying relational tables. The intermediate representation is then translated into an SQL query over the underlying relational tables. The intermediate representation is also used to generate a tagger graph, which the tagger runtime ‘walks’ to generate the tagged, structured XML output. Each of the nodes of the tagger graph are operators which perform processing on the results of the SQL query. The SQL query is executed, and the SQL query results are then provided to the tagger. The tagger runtime applies the operators of each node to the inputs at that node to produce the structured XML document as a query result, guided by the structure of the tagger graph.

Claims45

Dependent claims

A computer implemented method of tagging results of an XML query over a relational database, said method comprising:

generating a tagger tree graph from said XML query, each node of said tagger tree graph comprising a tagger operator, each tagger operator having a tagger parse tree associated therewith;
calling each tagger operator in accordance with a structure of said tagger tree graph, and evaluating said tagger parse trees associated with each called tagger operator to tag results of said XML query over said relational database.

A computer-based system for tagging results of an XML query over a relational database, said system comprising:

a tagger runtime component;
means for generating a tagger tree graph from said XML query, each node of said tagger tree graph comprising a tagger operator;
means for generating a tagger parse tree associated with each tagger operator, and wherein
said tagger runtime component calls each tagger operator in accordance with a structure of said tagger tree graph and evaluates said tagger parse trees associated with each called tagger operator to tag results of said XML query over said relational database.

1 more element

Dependencies are inferred from the claim text.

Tagging XML query results over relational DBMSs

Life of this patent

Tagging XML query results over relational DBMSs

Life of this patent

Abstract

Claims45