Journal of Information Processing
Maintaining knowledge about temporal intervals
Communications of the ACM
Building intelligent web applications using lightweight wrappers
Data & Knowledge Engineering - Special issue on heterogeneous information resources need semantic access
Querying Multimedia Presentations Based on Content
IEEE Transactions on Knowledge and Data Engineering
An algebra for creating and querying multimedia presentations
Multimedia Systems - Special issue: Multimedia authoring and presentation techniques
Elements Of Finite Model Theory (Texts in Theoretical Computer Science. An Eatcs Series)
Elements Of Finite Model Theory (Texts in Theoretical Computer Science. An Eatcs Series)
The Lixto data extraction project: back and forth between theory and practice
PODS '04 Proceedings of the twenty-third ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Efficient algorithms for processing XPath queries
ACM Transactions on Database Systems (TODS)
Semantic characterizations of navigational XPath
ACM SIGMOD Record
IEEE Transactions on Knowledge and Data Engineering
A Survey of Web Information Extraction Systems
IEEE Transactions on Knowledge and Data Engineering
Spatial graph grammars for graphical user interfaces
ACM Transactions on Computer-Human Interaction (TOCHI)
Structured Data Extraction from the Web Based on Partial Tree Alignment
IEEE Transactions on Knowledge and Data Engineering
Towards domain-independent information extraction from web tables
Proceedings of the 16th international conference on World Wide Web
Efficient algorithms for processing XPath queries
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
ACM Computing Surveys (CSUR)
Axiomatizing the Logical Core of XPath 2.0
Theory of Computing Systems
XPath evaluation in linear time with polynomial combined complexity
Proceedings of the twenty-eighth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
A new tractable subclass of the rectangle algebra
IJCAI'99 Proceedings of the 16th international joint conference on Artifical intelligence - Volume 1
Scalable web data extraction for online market intelligence
Proceedings of the VLDB Endowment
Qualitative spatial reasoning with topological information
Qualitative spatial reasoning with topological information
Towards a spatial instance learning method for deep web pages
ICDM'11 Proceedings of the 11th international conference on Advances in data mining: applications and theoretical aspects
SILA: a spatial instance learning approach for deep webpages
Proceedings of the 20th ACM international conference on Information and knowledge management
Spatial reasoning with rectangular cardinal relations
Annals of Mathematics and Artificial Intelligence
Feature-based object identification for web automation
Proceedings of the 28th Annual ACM Symposium on Applied Computing
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Querying data from presentation formats like HTML, for purposes such as information extraction, requires the consideration of tree structures as well as the consideration of spatial relationships between laid out elements. The underlying rationale is that frequently the rendering of tree structures is very involved and undergoing more frequent updates than the resulting layout structure. Therefore, in this paper, we present Spatial XPath (SXPath), an extension of XPath 1.0 that allows for inclusion of spatial navigation primitives into the language resulting in conceptually simpler queries on Web documents. The SXPath language is based on a combination of a spatial algebra with formal descriptions of XPath navigation, and maintains polynomial time combined complexity. Practical experiments demonstrate the usability of SXPath.