Index for accessing xml data

Details Index for accessing xml data Index for accessing xml data

G - Physics

06

F

G06F 17/30 (2006.01)

Patent

CA 2561734

Techniques are provided for indexing XML documents. According to one embodiment, a PATH table created for storing one row for each indexed node of the XML documents. The PATH table row for a node includes (1) information for locating the XML document that contains the node, (2) information that identifies the path of the node, and (3) information that identifies the position of the node within the hierarchical structure of the XML document that contains the node. If the node is associated with the value, then the PATH table row for the node may also include the value. Use of the PATH table to answer XPath queries is facilitated by secondary indexes.

La présente invention concerne des techniques permettant d'indexer des documents XML. Selon une forme de réalisation, une table CHEMIN est créée pour stocker une rangée correspondant à chaque noeud indexé des documents XML. La rangée de la table CHEMIN correspondant à un noeud comprend (1) des informations servant à localiser le document XML qui contient le noeud, (2) des informations qui identifient le chemin du noeud et (3) des informations qui identifient la position du noeud dans la structure hiérarchique du document XML qui contient le noeud. Si le noeud est associé à la valeur, la rangée de la table CHEMIN correspondant au noeud peut alors également comprendre la valeur. L'utilisation de la table CHEMIN pour répondre aux requêtes XChemin est facilitée par des index secondaires.

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