TY - CONF T1 - Path expressions for complex queries and automatic database program conversion T2 - Proceedings of the sixth international conference on Very Large Data Bases - Volume 6 Y1 - 1980 A1 - Shneiderman, Ben A1 - Thomas,Glenn KW - data definition language KW - data manipulation language KW - Database conversion KW - Database systems KW - path expressions KW - program conversion KW - query languages KW - transformation language AB - Our efforts to develop an automatic database system conversion facility yielded a powerful, yet simple query language which was designed for ease of conversion. The path expression of this query language is a convenient and appealing notation for describing complex traversals with multiple boolean qualifications. This paper describes the path expression, shows how automatic conversions can be done, introduces the boolean functions as part of the basic path expression, offers four extensions (path macros, implied path, path replacement, and path optimization), and discusses some implementation issues. JA - Proceedings of the sixth international conference on Very Large Data Bases - Volume 6 T3 - VLDB '80 PB - VLDB Endowment UR - http://dl.acm.org/citation.cfm?id=1286887.1286891 ER -