XQuery


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XQuery

(XML QUERY Language) A language for querying XML documents from the W3C. Compatible with related W3C standards (W3C XML Schema, XSLT, etc.), XQuery was derived from the XPath language and uses the same syntax for path expressions. Based on the XQuery data model, XQuery processes the query by parsing the XML document, the schema and the query into hierarchical node trees. It also generates an output schema with the query results. See XSL and DOM.
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Adicionalmente, se pueden plantear preguntas mas complejas a los modelos, que involucran propiedades cualitativas individuales y colectivas del sistema y que se pueden responder a partir de su semantica, pero que no consiguen ser resueltas solamente con consultas XQuery, sino que ademas requieren de la ejecucion de elaborados algoritmos.
Arora, "Native XQuery processing in oracle XMLDB," Proc.
In particular, the idea of mining association rules [1] to provide summarized representations of XML documents has been investigated in many proposals either by using languages (e.g., XQuery [2]) and techniques developed in the XML context, or by implementing graph-or-tree-based algorithms.
XQuery (Boag, et al., 2003) es un lenguaje, nacido para consultar fuentes de datos heterogeneas, el cual a su vez se inspira en el diseno de los siguientes lenguajes: (i) XPath y XQL (lenguajes orientados al documento (Draper, et al., 2003)).
The Genesis Query language is XQuery with syntactical simplifications; mainly, the syntactical XQuery overhead dealing with namespaces is eliminated.
Designed to meet the data transformation and aggregation needs of developers, the DataDirect Data Integration Suite contains the latest product releases of DataDirect XQuery [R], DataDirect XML Converters[R] (Java [TM] and NET) and Stylus Studio[R] in one simple, highly flexible and robust installation.
Many SQL-based DBMSs now support storing of XML data, as well as querying XML data directly using a query language such as XQuery.
XML programmers and database users will find Priscilla Walmsley's XQUERY (0596006349, $49.99) a specific, valuable reference which is based on the Xquery 1.0 standards and which offers a basic tutorial on specifications and programming with the query language base.
Because XPath complexity influences the complexity of query expressions (XQuery (25)) required to target document sections and data elements, these results suggest that searching XML document collections would be simpler and less prone to error with CLP-ML than CDA markup.
list-price = SELECT price * (1 + fee-rate) FROM HOUSES, AGENTS WHERE agent - id = id In general, a variety of approaches have been used to specify semantic mappings (for example, SQL, XQuery, GAV, LAV, and GLAV [Lenzerini 2002]).
Tambien debe elegir una o mas formas en las cuales representar el conocimiento requerido en la memoria del ordenador, es decir, el debe elegir una representacion del conocimiento, es aqui donde colocamos nuestro objetivo, el representar el conocimiento de un sistemas experto mediante XML y lenguajes de consulta del mismo, como pueden ser: Xquery, Xpath, XSD y XSLT y su manipulacion mediante una maquina de inferencia realizada en JAVA.