Download XQuery: Search Across a Variety of XML Data by Priscilla Walmsley PDF

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By Priscilla Walmsley

With XQuery, you ultimately have a device that would make it a lot more straightforward to look, extract and manage info from XML content material saved in databases. up-to-date for XQuery 3.0, this in-depth educational not just walks you thru the XQuery specification, but in addition teaches you ways to software with this hugely useful question language.

XQuery is for question writers who've a few wisdom of XML fundamentals, yet now not inevitably complicated wisdom of XML-related applied sciences. it may be used either as an instructional, via analyzing hide to hide, and as a reference, through the use of the excellent index and appendixes. both method, you can find the historical past wisdom in namespaces, schemas, integrated varieties and standard expressions that's suitable to writing XML queries.

This moment variation provides:

  • A high-level evaluation and fast journey of XQuery
  • New chapters on swap expressions, dynamic functionality calls, and different features
  • Information to jot down refined queries, with no being slowed down by means of the main points of sorts, namespaces, and schemas
  • Advanced innovations 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 services and types

You’ll additionally find out about XQuery's help for filtering, sorting, and grouping information, in addition to how you can use FLWOR expressions, XPath, and XQuery instruments for extracting and mixing details. observe find out how to observe all of those instruments to a wide selection of knowledge assets, and the way to recombine details from a number of assets right into a unmarried ultimate output result.

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Extra resources for XQuery: Search Across a Variety of XML Data

Example text

A query con‐ tains expressions that can be made up of a number of sub-expressions, which may themselves be composed from other sub-expressions. This chapter explains the XQuery syntax, and covers the most basic types of expressions that can be used in queries: literals, variables, function calls, and comments. Categories of Expressions A query can range in complexity from a single expression such as 2+3, to a complex composite expression like a FLWOR. xml")/catalog/product, which is a path expression.

There is a lot of overlap in the capabilities of XQuery and XSLT. XSLT makes use of XPath, so it has the same data model and supports all the same built-in functions and operators as XQuery, as well as many of the same expressions. Some of the differences between XQuery and XSLT are: • XSLT implementations are generally optimized for transforming entire docu‐ ments. 0, the use case is typically handling a single docu‐ ment at a time. XQuery is optimized for selecting fragments of data, for example, from a database.

The results are often XML elements (or entire documents), but a query could also return a result that is not XML, for example a string or an array of integers. Depending on the implementa‐ tion, these results can then be written to a physical file, sent to a user interface, or passed to another application for further processing. 40 | Chapter 2: XQuery Foundations Writing the results to a physical XML document is known as serialization. In your query you can specify that you want the output serialized as XML, HTML, XHTML, text, or JSON.

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