By Denilson Barbosa, Angela Bonifati, Zohra Bellahsène, Ela Hunt, Rainer Unland
This publication constitutes the refereed complaints of the fifth overseas XML Database Symposium, XSym 2007, held in Vienna, Austria, in September 2007 along side the foreign convention on Very huge facts Bases, VLDB 2007.
The eight revised complete papers including 2 invited talks and the prolonged summary of one panel consultation have been conscientiously reviewed and chosen from 25 submissions. masking all present features of center database expertise for XML facts administration, XML and knowledge integration, and improvement and deployment of XML functions, the papers are geared up in topical sections on XPath question answering, XQuery review and function, in addition to XML updates, temporal XML information and concurrency.
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Extra info for Database and XML Technologies: 5th International XML Database Symposium, XSym 2007, Vienna, Austria, September 23-24, 2007, Proceedings
9th Int. Conf. on Database Theory, pp. 300–314 (2003) Fast Answering of XPath Query Workloads on Web Collections Mariano P. edu Abstract. Several web applications (such as processing RSS feeds or web service messages) rely on XPath-based data manipulation tools. Web developers need to use XPath queries eﬀectively on increasingly larger web collections containing hundreds of thousands of XML documents. ). Dealing with the (highly variable) structure of such web collections poses additional challenges.
Deﬁnition 4 (Labeled Bisimulation). Let G1 and G2 be two subgraphs of an axis graph A, such that AxesG1 ⊆ Axes and AxesG2 ⊆ Axes. A labeled bisimulation between G1 and G2 is a symmetric relation ≈ such that for all v ∈ G1 , w ∈ G2 , EiG1 ∈ AxesG1 , and EiG2 ∈ AxesG2 : if v ≈ w, then λ(v) = λ(w); if v ≈ w, and v, v ∈ EiG1 , then w, w ∈ EiG2 and v ≈ w . Example 2. f s) accepting all preﬁxes (Deﬁnition 3). Both neighbourhoods consist of the subgraph given by the c edges from 14, c edges from 18 and 24, and the f s edge between 18 and 24.
L(locpathm )) (7) Fig. 3. AxPRE derivation functions L and P Example 3. /item/pubDate)]] Q3 returns all channels that have RDF or rss parents and item children with a pubDate diﬀerent from the pubDate of the ﬁrst item in the channel. Note that the structural subquery appears in black (the last predicate in grey is not part of the structural subquery) and that Q3 is in abbreviated syntax (channel and item for instance, mean child :: channel and child :: item, respectively). /item/pubDate)] and Ax is a function that translates the XPath axis into its AxPRE axis counterpart.