By Jim Melton
XML has turn into the lingua franca for representing enterprise info, for changing details among enterprise companions and purposes, and for including structure–
and occasionally meaning―to text-based files. XML deals a few targeted demanding situations and possibilities within the sector of seek: querying XML can produce very distinctive, fine-grained effects, when you know the way to precise and execute these queries.
For software program builders and structures architects: this booklet teaches the main helpful methods to querying XML records and repositories. This publication also will support managers and undertaking leaders snatch how “querying XML” matches into the bigger context of querying and XML. Querying XML presents a complete history from primary suggestions (What is XML?) to facts versions (the Infoset, PSVI, XQuery information Model), to APIs (querying XML from SQL or Java) and extra.
* offers the techniques sincerely, and demonstrates them with illustrations and examples; deals a radical mastery of the topic zone in one booklet.
* offers complete assurance of XML question languages, and the thoughts had to comprehend them thoroughly (such because the XQuery info Model).
* exhibits easy methods to question XML files and knowledge utilizing: XPath (the XML direction Language); XQuery, quickly to be the hot W3C advice for querying XML; XQuery's better half XQueryX; and SQL, that includes the SQL/XML
* comprises an in depth set of XQuery, XPath, SQL, Java, and different examples, with hyperlinks to downloadable code and information samples.
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Extra info for Querying XML: XQuery, XPath, and SQL XML in context
LaTeX TeX21 is a macro-based text formatting language produced by Donald Knuth. Disappointed with the quality of the typesetting in his Art of Computer Programming,22 Knuth started writing TeX in 1978. It 21 22 Donald E. Knuth, The TeXBook (New York: Addison-Wesley Professional, 1984). Donald E. Knuth, The Art of Computer Programming, Volumes 1 - 3 (New York: Addison-Wesley Professional, 1998). 5 Some Other Ways to Represent Data 25 quickly became popular enough to displace troff in the technical typesetting community.
The follow ing lines describe the "shape" of each of these elements. 3 For example, it does not distinguish between runningTime (which is probably an integer) and title (which is probably a string). XML Schema DTDs have a couple of drawbacks - they don't include any data type information about fields,4 and DTDs are not XML documents. XML Schema solves both these problems. Like a DTD, an XML Schema defines where elements may occur in a document, and in what order, in a formal, standard way. ) and give rules about which values are allowed.
And SQL has the notions of transac tions and updates, which the XML world (at the time of writing) has only just begun to consider. Add to that the availability and maturity of robust, scalable SQL databases, indexing technology, expertise, 20 We could have movie IDs in the PRODUCERS table, but we assume a producer produces several movies. 24 Chapter 1 XML and tools, and you can see why SQL is still the preferred way to structure, store, and query data in many applications. 2 Presentation Languages - Presentation Only There is a family of markup languages that deal only with presenta tion and have nothing to say about structure or semantics.