A logical query language for hypertext systems
Hypertext: concepts, systems and applications
Querying object-oriented databases
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Logical foundations of object-oriented and frame-based languages
Journal of the ACM (JACM)
Finding Regular Simple Paths in Graph Databases
SIAM Journal on Computing
Evaluating queries with generalized path expressions
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
A query language and optimization techniques for unstructured data
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
On saying “Enough already!” in SQL
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
STRUDEL: a Web site management system
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Regular path queries with constraints
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Path constraints on semistructured and structured data
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Graph-theoretic methods in database theory
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
GraphLog: a visual formalism for real life recursion
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
A graph-oriented object database model
PODS '90 Proceedings of the ninth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Fast Algorithms for Solving Path Problems
Journal of the ACM (JACM)
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Introduction To Automata Theory, Languages, And Computation
Introduction To Automata Theory, Languages, And Computation
Querying Semistructured Heterogeneous Information
DOOD '95 Proceedings of the Fourth International Conference on Deductive and Object-Oriented Databases
Queries on Structures in Hypertext
FODO '93 Proceedings of the 4th International Conference on Foundations of Data Organization and Algorithms
Queries and Computation on the Web
ICDT '97 Proceedings of the 6th International Conference on Database Theory
ICDT '97 Proceedings of the 6th International Conference on Database Theory
W3QS: A Query System for the World-Wide Web
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
A Declarative Language for Querying and Restructuring the Web
RIDE '96 Proceedings of the 6th International Workshop on Research Issues in Data Engineering (RIDE '96) Interoperability of Nontraditional Database Systems
GrassRoots: socially-driven web sites for the masses
Proceedings of the 2nd ACM workshop on Online social networks
Querying graphs with preferences
Proceedings of the 22nd ACM international conference on Conference on information & knowledge management
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In this paper we present an extension of regular languages to support graph queries. The proposed extension is based on the introduction of a partial order on the strings of the languages. We extend regular expressions and regular grammars by introducing partial orders on strings and production rules, respectively. The relations between regular expressions and regular grammars are analyzed. We show how partially ordered languages can be used to define path queries to search graph databases and present results on their computational complexity. Finally, we present an application of partially ordered languages for searching the Web.