@inproceedings{3480385c2d0a4e62879146e4f90e3533,
title = "XML with data values: Typechecking revisited",
abstract = "We investigate the typechecking problem for XML queries: statically verifying that every answer to a query conforms to a given output DTD, for inputs satisfying a given input DTD. This problem had been studied by a subset of the authors in a simplified framework that captured the structure of XML documents but ignored data values. We revisit here the typechecking problem in the more realistic case when data values are present in documents and tested by queries. In this extended framework, typechecking quickly becomes undecidable. However, it remains decidable for large classes of queries and DTDs of practical interest. The main contribution of the present paper is to trace a fairly tight boundary of decidability for typechecking with data values. The complexity of typechecking in the decidable cases is also considered.",
author = "N. Alon and T. Milo and F. Neven and D. Suciu and V. Vianu",
year = "2001",
month = may,
day = "1",
language = "English",
series = "Proceedings of the ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems",
publisher = "Association for Computing Machinery (ACM)",
pages = "138--149",
booktitle = "Proceedings of the 20th ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems, PODS 2001",
address = "United States",
note = "20th ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, PODS 2001 ; Conference date: 21-05-2001 Through 23-05-2001",
}