By Priscilla Walmsley
With the XQuery 1.0 usual, you eventually have a device that may make it a lot more straightforward to go looking, extract and manage details from XML content material kept in databases. This in-depth instructional not just walks you thru the XQuery specification, but in addition teaches you the way to application with this extensively expected question language.XQuery is for question writers who've a few wisdom of XML fundamentals, yet no longer unavoidably complex wisdom of XML-related applied sciences. it may be used either as an academic, by means of examining conceal to hide, and as a reference, through the use of the excellent index and appendixes. both method, you'll find the heritage wisdom in namespaces, schemas, integrated varieties and commonplace expressions that's appropriate to writing XML queries. This booklet presents: A high-level evaluation and fast travel of XQuery details to write down subtle queries, with out being slowed down by means of the main points of sorts, namespaces, and schemas complicated ideas for clients who are looking to benefit from modularity, namespaces, typing and schemas directions for operating with particular forms of info, corresponding to numbers, strings, dates, URIs and processing directions a whole alphabetical connection with the integrated capabilities and typesYou also will find out about XQuery's aid for filtering, sorting, and grouping information, in addition to tips to use FLWOR expressions, XPath, and XQuery instruments for extracting and mixing details. With this ebook, you'll find tips on how to practice all of those instruments to a large choice of information assets, and the way to recombine info from a number of resources right into a unmarried ultimate output result.Whether you're coming from SQL, XSLT, or ranging from scratch, this rigorously paced educational takes you thru the ultimate 1.0 regular intimately.
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Extra info for XQuery
It does a simple value comparison and returns true if the value is between the bounds. To call this function, you might use the following function call to test whether a product number is between 1 and 500: functx:between-inclusive ($prod/number, 1, 500) This function is the first of many “useful functions” that are included in this book. You can use them not just as examples but also directly in your queries. com. Node Comparisons Another type of comparison is the node comparison. To determine whether two operands are actually the same node, you can use the is operator.
The first argument is a variable reference, whereas the other two are numeric literals. The XQuery language has over 100 built-in functions, detailed in Appendix A. Chapter 8 explains the details of how to read function signatures and call them. It also explains how to define your own functions. Comments XQuery comments, delimited by (: and :), can be added to any query to provide more information about the query itself. These comments are ignored during processing. XQuery comments can contain any text, including XML markup.
A Basic XQuery processor XML Input Documents Throughout this book, the term input document is used to refer to the XML data that is being queried. The data that is being queried can, in fact, take a number of different forms, for example: • Text files that are XML documents • Fragments of XML documents that are retrieved from the Web using a URI • A collection of XML documents that are associated with a particular URI • Data stored in native XML databases • Data stored in relational databases that have an XML frontend • In-memory XML documents Some queries use a hardcoded link to the location of the input document(s), using the doc or collection function in the query.