Walmsley Priscilla. XQuery: Search Across a Variety of XML Data

2nd Edition. — O’Reilly Media, 2015. — 758 p. — ISBN10: 1491915102, ISBN13: 978-1491915103.The W3C XQuery 3.1 standard provides a tool to search, extract, and manipulate content, whether it's in XML, JSON or plain text. With this fully updated, in-depth tutorial, you’ll learn to program with this highly practical query language.Designed for query writers who have some knowledge of XML basics, but not necessarily advanced knowledge of XML-related technologies, this book is ideal as both a tutorial and a reference. You’ll find background information for namespaces, schemas, built-in types, and regular expressions that are relevant to writing XML queries.This second edition provides:
A high-level overview and quick tour of XQuery;
New chapters on higher-order functions, maps, arrays, and JSON;
A carefully paced tutorial that teaches XQuery without being bogged down by the details;
Advanced concepts for taking advantage of modularity, namespaces, typing, and schemas;
Guidelines for working with specific types of data, such as numbers, strings, dates, URIs, maps and arrays;
XQuery’s implementation-specific features and its relationship to other standards including SQL and XSLT;
A complete alphabetical reference to the built-in functions, types, and error messages.