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Adql Compiler

Work in progress. Some documents, details and code regarding a compiler to turn Adql/s into Adql/x

Introduction: Working details of a compiler to turn a string form of ADQL into xml format. ADQL is the Astronomical Data Query Language, based on a subset of SQL92. The compiler follows closely the ADQL specification as at April 2007. Variations are detailed in the BNF diagrams.
adql-notes.doc: Notes regarding the development of the compiler. More specific notes regarding syntax and variations from the spec are contained in the BNF diagrams.
ADQL v2.0 In BNF format: BNF Syntax diagrams. Each construct is an active link. As close to the April 2007 ADQL spec as I can manage. Variations from the spec are commented upon. There are some experimentations to do with user-defined functions, region predicate, and the possibility of including scripting variables within a query. The preview compiler is at this level.
adqlcompiler-preview-20070823.zip: Adql compiler, all required supporting jars, plus two shell scripts to run the compiler from the command line either interactively or in batch mode.