33 search results - page 3 / 7 » Semantic characterizations of navigational XPath |
ICDT
2010
ACM
13 years 9 months ago
2010
ACM
When a query is evaluated under bag semantics, each answer is returned as many times as it has derivations. Bag semantics has long been recognized as important, especially when ag...
SIGMOD
2007
ACM
14 years 7 months ago
2007
ACM
To compensate for the inherent impedance mismatch between the relational data model (tables of tuples) and XML (ordered, unranked trees), tree join algorithms have become the prev...
ICDE
2004
IEEE
14 years 8 months ago
2004
IEEE
We describe and evaluate a query minimization technique that applies to XQueries, which are nested, perform arbitrary joins, and freely mix bag and set semantics. These features c...
PEPM
2011
ACM
12 years 9 months ago
2011
ACM
Navigating through tree structures is a core operation in tree processing programs. Most notably, XML processing programs intensively use XPath, the path specification language t...
WEBDB
2004
Springer
14 years 9 days ago
2004
Springer
On the Web, there is a pervasive use of XML to give lightweight semantics to textual collections. Such documentcentric XML collections require a query language that can gracefully...