By Priscilla Walmsley

With the XQuery 1.0 commonplace, you ultimately have a device that may make it a lot more uncomplicated to look, extract and control details from XML content material kept in databases. This in-depth educational not just walks you thru the XQuery specification, but additionally teaches you ways to application with this commonly expected question language.

XQuery is for question writers who've a few wisdom of XML fundamentals, yet now not unavoidably complicated wisdom of XML-related applied sciences. it may be used either as an educational, by means of interpreting hide to hide, and as a reference, by utilizing the great index and appendixes. both approach, you'll find the historical past wisdom in namespaces, schemas, integrated forms and standard expressions that's suitable to writing XML queries. This publication provides:

  • A high-level evaluate and quickly travel of XQuery
  • Information to jot down subtle queries, with out being slowed down by means of the main points of varieties, namespaces, and schemas
  • Advanced strategies for clients who are looking to reap the benefits of modularity, namespaces, typing and schemas
  • Guidelines for operating with particular sorts of info, reminiscent of numbers, strings, dates, URIs and processing instructions
  • A entire alphabetical connection with the integrated capabilities and types

You also will know about XQuery's help for filtering, sorting, and grouping info, in addition to tips on how to use FLWOR expressions, XPath, and XQuery instruments for extracting and mixing info. With this ebook, you can find the right way to observe all of those instruments to a wide selection of knowledge resources, and the way to recombine details from a number of assets right into a unmarried ultimate output result.

Whether you are coming from SQL, XSLT, or ranging from scratch, this rigorously paced instructional takes you thru the ultimate 1.0 usual in detail.

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Preface | xv Chapter 1 bankruptcy 1 creation to XQuery 1 This bankruptcy offers history at the goal and functions of XQuery. It additionally supplies a brief advent to the positive factors of XQuery which are lined in additional aspect later within the ebook. it truly is designed to supply a simple familiarity with the main regularly occurring forms of expressions, with no getting too slowed down within the information. what's XQuery? using XML has exploded in recent times. a big quantity of data is now kept in XML, either in XML databases and in records on a filesystem.

So, the expression $deptNames/dept[@code = $dept]/@name traverses the deptNames constitution searching for the dep. identify the place the code fits the dep. code in query. This answer is less complicated to take care of and it makes the mappings extra seen. after all, if this can be a general-purpose and unchanging look up desk that will be utilized in many queries, it might probably on the other hand be saved as a separate XML record that's referenced utilizing the document functionality. one hundred twenty | bankruptcy nine: complex Queries Reducing Complexity within the prior instance, the intermediate XML used to be hardcoded into the question.

Invaluable functionality: remove-elements-deep claim namespace functx = "http://www. functx. com"; claim functionality functx:remove-elements-deep ($element as element(), $names as xs:string*) as aspect( ) { point {node-name($element)} {$element/@*, for $child in $element/node( ) go back if ($child example of aspect( )) then if ($child[name( ) = $names]) then ( ) else functx:remove-elements-deep($child, $names) else $child } }; one other universal use case is to take away yes parts yet preserve their contents.

28 | bankruptcy three: Expressions: XQuery development Blocks Variables may be sure in numerous different types of expressions: in worldwide variable declarations, for or permit clauses of a FLWOR, quantified expressions, or typeswitch expressions. for instance, assessment of the FLWOR: for $prod in doc("catalog. xml")/catalog/product go back $prod/number binds the $prod variable to a node back via the trail expression doc("catalog. xml")/ catalog/product. The variable is then referenced within the go back clause. functionality declarations additionally bind variables to values.

Ninety nine integrated as opposed to User-Defined capabilities Calling services User-Defined capabilities ninety nine ninety nine 103 nine. complex Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a hundred and ten Copying enter components with variations operating with Positions and series Numbers Combining effects utilizing Intermediate XML files vi | desk of Contents one hundred ten one hundred fifteen 118 119 10. Namespaces and XQuery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 XML Namespaces Namespaces and XQuery Namespace Declarations in Queries Controlling Namespace Declarations on your effects 123 127 128 a hundred thirty five eleven.

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