Requêtes OLAP sur une base de données XML native - Cercle ...

(a) (b) (c)
Fig. 1.3. XPath semantics: signposted nodes are nodes of the result forest if an
(a) 4.2parent::*, XPath (b) ancestor::*, and (c) ancestor-or-self::* step is taken from context 30
node 7.
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(a) (b) (c)
1.5. Another XML Technologies 17
Fig.
1.5.
4.2
Another
– Sémantique
XML Technologies
des axes XPath : (a) child : :*, (b) descendant : :*
17
et (c)
Fig. descendant-or-self 1.4. XPath semantics: : : à 0partirsignposted
du nœud 1. nodes are nodes of the result forest if an
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(a) child::*, (b) descendant::*, 1
6 and (c) descendant-or-self::* 1
6 step is taken from
context node 1.
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1.4.2 XQuery2
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3 4
The XQuery [80] is a hopeful XML query language today. A subset of the XPath is a
part of the XQuery but more (a) complex constructs are put into the (b) language. Therefore, the
XQuery Fig. is1.5. said to XPath be too semantics: complex. signposted nodes are nodes of the result forest if an
Fig. (a) 4.3 preceding::* – Sémantique and des axes (b) following::* XPath : (a) preceding step is taken : :*, from(b) context following node : 6 and :* à1, partir re- du
Fig. 1.5. XPath semantics: signposted nodes are nodes of the result forest if an
Example nœud spectively. 6 et 11.9 respectivement.
(XQuery queries).
(a) preceding::* and (b) following::* step is taken from context node 6 and 1, respectively.
0
In Listing 1.6 three XQuery queries are shown.
0
1. doc(’books.xml’)/books/book[price50
Fig. order 4.4 by – $x/name Sémantique des (a) axes XPath : (a) preceding-sibling (b) : :*, (b) followingsibling
return Fig. $x/name : 1.6. :* àXPath partir du semantics: nœud 6 et signposted 2 respectivement. nodes are nodes of the result forest if an
(a) preceding-sibling::* and (b) following-sibling::* step is taken from context
3. node Fig. 61.6. and 2, XPath respectively. semantics: signposted nodes are nodes of the result forest if an
La { première (a) preceding-sibling::* est réduite, l’autre est and complète (b) following-sibling::* :
step is taken from context
node for $b 6 and in doc(’books.xml’)/books/book,
2, respectively.
/ clients / client $n in $b/name, [ @id ="1548"]/ nom
/ child :: clients $a in $b/author / child :: client [ @id ="1548"]/ child :: nom
return $n in $b/name,
D’autres raccourcis $a in $b/author sont fournis par XPath, par exemple,
return { $n }
⊲ l’expression { $a } ./ décrit le nœud contexte.
{ $n }
⊲ l’expression } { $a ../ } indique le nœud parent.
⊲ l’expression // dénote le nœud racine, mais pour une expression de type a//b, cette
}
expression dénote n’importe quel nœud b descendant du nœud a.
1.5 Another XML Technologies
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Le tableau 4.1 liste les axes XPath et explique brièvement leur sémantique. Les figures 4.1,
4.2, 1.5 4.3 et 4.4 Another illustrent la sémantique XML Technologies
des principaux axes XPath.
There are a lot of technologies related to the XML. Due to the fact that this book is aimed
only to indexing XML data some of them are briefly described. SOAP [91] is the Simple
Object There are Access a lotProtocol of technologies used forrelated invoketo code theoffered XML. by Due Web to the services fact that overthis the Internet book is aimed using
XML only to and indexing HTTP. XML data some of them are briefly described. SOAP [91] is the Simple
Object Access Protocol used for invoke code offered by Web services over the Internet using
XML and HTTP.
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