Sciweavers

591 search results - page 12 / 119
» The complexity of XPath query evaluation
Sort
View
INEX
2004
Springer
14 years 2 months ago
Narrowed Extended XPath I (NEXI)
INEX has through the years provided two types of queries: Content-Only queries (CO) and Content-And-Structure queries (CAS). The CO language has not changed much, but the CAS lang...
Andrew Trotman, Börkur Sigurbjörnsson
PLANX
2007
13 years 10 months ago
XPath Typing Using a Modal Logic with Converse for Finite Trees
We present an algorithm to solve XPath decision problems under regular tree type constraints and show its use to statically typecheck XPath queries. To this end, we prove the deci...
Pierre Genevès, Nabil Layaïda, Alan Sc...
CIKM
2009
Springer
14 years 3 months ago
ASIC: algebra-based structural index comparison
Structural indices play a significant role in improving the efficiency of XML query evaluation. Being able to compare various structural indexing techniques is critical for a DBM...
Yuqing Wu, Sofia Brenes, Tejas Totade, Shijin Josh...
ICALP
2005
Springer
14 years 2 months ago
Tight Lower Bounds for Query Processing on Streaming and External Memory Data
We study a clean machine model for external memory and stream processing. We show that the number of scans of the external data induces a strict hierarchy (as long as work space is...
Martin Grohe, Christoph Koch, Nicole Schweikardt
PODS
2005
ACM
131views Database» more  PODS 2005»
14 years 9 months ago
Buffering in query evaluation over XML streams
All known algorithms for evaluating advanced XPath queries (e.g., ones with predicates or with closure axes) on XML streams employ buffers to temporarily store fragments of the do...
Ziv Bar-Yossef, Marcus Fontoura, Vanja Josifovski