Implicit representation of graphs
STOC '88 Proceedings of the twentieth annual ACM symposium on Theory of computing
Storing semistructured data with STORED
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Compact labeling schemes for ancestor queries
SODA '01 Proceedings of the twelfth annual ACM-SIAM symposium on Discrete algorithms
On supporting containment queries in relational database management systems
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
Improved labeling scheme for ancestor queries
SODA '02 Proceedings of the thirteenth annual ACM-SIAM symposium on Discrete algorithms
Holistic twig joins: optimal XML pattern matching
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
Relational Databases for Querying XML Documents: Limitations and Opportunities
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
Indexing and Querying XML Data for Regular Path Expressions
Proceedings of the 27th International Conference on Very Large Data Bases
Maintaining order in a linked list
STOC '82 Proceedings of the fourteenth annual ACM symposium on Theory of computing
XPRESS: a queriable compression for XML data
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
D(k)-index: an adaptive structural summary for graph-structured data
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
A comprehensive XQuery to SQL translation using dynamic interval encoding
Proceedings of the 2003 ACM SIGMOD international conference on Management of data
From XML Schema to Relations: A Cost-Based Approach to XML Storage
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Structural Joins: A Primitive for Efficient XML Query Pattern Matching
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Exploiting Local Similarity for Indexing Paths in Graph-Structured Data
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Accelerating XPath evaluation in any RDBMS
ACM Transactions on Database Systems (TODS)
Recursive XML Schemas, Recursive XML Queries, and Relational Storage: XML-to-SQL Query Translation
ICDE '04 Proceedings of the 20th International Conference on Data Engineering
BLAS: an efficient XPath processing system
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
ORDPATHs: insert-friendly XML node labels
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
BOXes: Efficient Maintenance of Order-Based Labeling for Dynamic XML Data
ICDE '05 Proceedings of the 21st International Conference on Data Engineering
System RX: one part relational, one part XML
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
On boosting holism in XML twig pattern matching using structural indexing techniques
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
Native Xquery processing in oracle XMLDB
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
Designing information-preserving mapping schemes for XML
VLDB '05 Proceedings of the 31st international conference on Very large data bases
From region encoding to extended dewey: on efficient processing of XML twig pattern matching
VLDB '05 Proceedings of the 31st international conference on Very large data bases
Query translation from XPATH to SQL in the presence of recursive DTDs
VLDB '05 Proceedings of the 31st international conference on Very large data bases
MonetDB/XQuery: a fast XQuery processor powered by a relational engine
Proceedings of the 2006 ACM SIGMOD international conference on Management of data
Xpath on steroids: exploiting relational engines for xpath performance
Proceedings of the 2007 ACM SIGMOD international conference on Management of data
Efficient structural joins on indexed XML documents
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Efficiently Querying Large XML Data Repositories: A Survey
IEEE Transactions on Knowledge and Data Engineering
RRXS: redundancy reducing XML storage in relations
VLDB '03 Proceedings of the 29th international conference on Very large data bases - Volume 29
Indexing XML data stored in a relational database
VLDB '04 Proceedings of the Thirtieth international conference on Very large data bases - Volume 30
Improving the efficiency of XPath execution on relational systems
EDBT'06 Proceedings of the 10th international conference on Advances in Database Technology
L-Tree: a dynamic labeling structure for ordered XML data
EDBT'04 Proceedings of the 2004 international conference on Current Trends in Database Technology
Efficient physical operators for cost-based XPath execution
Proceedings of the 13th International Conference on Extending Database Technology
XML privacy protection model based on cloud storage
Computer Standards & Interfaces
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We present BLAS, a Bi-LAbeling based XPath processing System. BLAS uses two labeling schemes to speed up query processing: P-labeling for processing consecutive child (or parent) axis traversals, and D-labeling for processing descendant (or ancestor) axis traversals. XML data are stored in labeled form and indexed. Algorithms are presented for translating XPath queries to SQL expressions. BLAS reduces the number of joins in the SQL query translated from a given XPath query and reduces the number of disk accesses required to execute the SQL query compared with the traditional XPath processing using D-labeling alone. We also propose an approximate P-labeling scheme and the corresponding query translation algorithm to handle XML data trees that contain a large number of distinct tag names, and/or are very deep. This extension captures a spectrum of XPath-to-SQL query translation schemes, ranging from existing schemes that do not use P-labels to the one that uses exact P-labels. Experimental results demonstrate the efficiency of the BLAS system.