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XML, XSLT, XPath, XQuery

XML, XSLT, XPath, XQuery. 5 Aug 2002. Introduction. XML (eXtensible Markup Language) Holding data XSLT (eXtensible Style Language Transform) Transform one XML to another XML or other text such as HTML XPath (XML Path) A way to locate items in a XML file XQuery (XML Query)

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XML, XSLT, XPath, XQuery

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  1. XML, XSLT, XPath, XQuery 5 Aug 2002

  2. Introduction • XML (eXtensible Markup Language) • Holding data • XSLT (eXtensible Style Language Transform) • Transform one XML to another XML or other text such as HTML • XPath (XML Path) • A way to locate items in a XML file • XQuery (XML Query) • Query on one or more XML file to produce another XML file

  3. Properties Semi-structured structured Exchange and sharing storage Self-describing RDMS enforced constraint Analogy

  4. SpecifyXSL for display Sample XML (link) <?xml:stylesheet type="text/xsl" href="classical.xsl"?> <authors> <author period="Classical"> <name>Mozart</name> <nationality>Austrian</nationality> </author> <author period="Classical"> <name>Beethoven</name> <nationality>German</nationality> </author> <author period="Baroque"> <name>Bach</name> <nationality>German</nationality> </author> <author period="Romance"> <name>Mahler</name> <nationality>Austrian</nationality> </author> </authors>

  5. DOM Tree Root Node Element Node Text Node authors Attribute Node author author author period Classical name nationality period Classical name nationality period Baroque name nationality Mozart Austrian Beethoven German Bach German

  6. XSL version XPath Sample XSL (link) <xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl"> <xsl:template match="/"> <HTML> <HEAD><TITLE>Authors</TITLE></HEAD> <BODY> <H1>Composers from Austria</H1> <TABLE BORDER="1"><TR><TH>Name</TH></TR> <xsl:for-each select="/authors/author[nationality='Austrian']"> <TR><TD><xsl:value-ofselect="name" /></TD></TR> </xsl:for-each> </TABLE> </BODY> </HTML> </xsl:template> </xsl:stylesheet>

  7. Output (link) Original XML Transformed XML

  8. Sample XSL <xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl"> <xsl:template match="/"> <HTML> <HEAD><TITLE>Authors</TITLE></HEAD> <BODY> <H1>Composers from classical period</H1> <TABLE BORDER="1"> <TR><TH>Name</TH></TR> <xsl:for-each select="/authors/author[@period='Classical']"> <TR><TD><xsl:value-ofselect="name" /></TD></TR> </xsl:for-each> </TABLE> </BODY> </HTML> </xsl:template> </xsl:stylesheet>

  9. Output Original XML Transformed XML

  10. P2P Example (link) <peer ip=“137.189.89.7”> <image name=“a.jpg”> <signature>15</signature> </image> <image name=“b.jpg”> <signature>20</signature> </image> <image name=“c.jpg”> <signature>13</signature> </image> <image name=“d.jpg”> <signature>5</signature> </image> </node>

  11. XQuery (link) (xquery) <result> { FOR $i IN document(“index.xml")/peer/image WHERE $i/signature > “10” AND $i/signature < “16” RETURN $i } </result> > sample –f index.xml –a index.xml –q query.xqu <result> <image filename="a.jpg"> <signature>15</signature> </image> <image filename="c.jpg"> <signature>13</signature> </image> </result>

  12. XQuery XML Validatingparser XQuery engine DTD/schema Browser XSL XML/text/HTML Assist XPath Illustration XML

  13. Web/Gnutellagateway XML Web XQuery Otherpresentationmethod XQuery Other P2Pclient Possible Application XMLindex file XMLindex file XMLindex file XMLindex file XMLindex file P2P

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