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By Priscilla Walmsley

With the XQuery 1.0 general, you eventually have a device that would make it a lot more uncomplicated to go looking, extract and manage info from XML content material kept in databases. This in-depth educational not just walks you thru the XQuery specification, but in addition teaches you the way to application with this broadly 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, via examining conceal to hide, and as a reference, through the use of the excellent index and appendixes. both method, you can find the history wisdom in namespaces, schemas, integrated kinds and average expressions that's correct to writing XML queries. This booklet provides:

  • A high-level evaluation and speedy travel of XQuery
  • Information to write down refined queries, with out being slowed down via the main points of varieties, namespaces, and schemas
  • Advanced strategies for clients who are looking to make the most of modularity, namespaces, typing and schemas
  • Guidelines for operating with particular forms of info, akin to numbers, strings, dates, URIs and processing instructions
  • A entire alphabetical connection with the integrated features and types

You also will know about XQuery's aid for filtering, sorting, and grouping info, in addition to find out how to use FLWOR expressions, XPath, and XQuery instruments for extracting and mixing details. With this booklet, you'll find easy methods to practice all of those instruments to a wide selection of knowledge resources, and the way to recombine details from a number of resources right into a unmarried ultimate output result.

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

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141 The XQuery sort process The integrated kinds forms, Nodes, and Atomic Values style Checking in XQuery computerized sort Conversions series varieties Constructors and Casting 141 143 a hundred forty five 146 147 151 one hundred fifty five 12. Queries, Prologs, and Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a hundred and sixty constitution of a question: Prolog and physique Assembling Queries from a number of Modules Variable Declarations mentioning exterior features a hundred and sixty 163 166 168 thirteen. utilizing Schemas with XQuery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . one hundred seventy what's a Schema? Why Use Schemas with Queries? W3C XML Schema: a short evaluation In-Scope Schema Definitions Schema Validation and sort project series varieties and Schemas one hundred seventy 171 172 a hundred seventy five 178 183 14. Static Typing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 what's Static Typing? The Typeswitch Expression The deal with Expression sort Declarations The zero-or-one, one-or-more, and exactly-one capabilities 185 187 189 a hundred ninety 192 15. rules of question layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 question layout ambitions readability Modularity 193 193 196 desk of Contents | vii Robustness mistakes dealing with functionality 196 199 201 sixteen. operating with Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204 The Numeric kinds developing Numeric Values evaluating Numeric Values mathematics Operations services on Numbers 204 205 206 207 211 17. operating with Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 The xs:string sort developing Strings evaluating Strings Substrings discovering the size of a String Concatenating and Splitting Strings Manipulating Strings Whitespace and Strings Internationalization issues 213 213 214 216 217 218 220 222 223 18. commonplace Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 The constitution of a standard Expression Representing person Characters Representing Any personality Representing teams of Characters personality classification Expressions Reluctant Quantifiers Anchors Back-References utilizing Flags utilizing Sub-Expressions with alternative Variables 226 228 229 230 233 235 236 237 238 239 19. operating with Dates, instances, and intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 The Date and Time varieties The length forms Extracting elements of Dates, instances, and periods utilizing mathematics Operators on Dates, instances, and intervals The Date part varieties viii | desk of Contents 242 246 248 249 252 20. operating with certified Names, URIs, and IDs . . . . . . . . . . . . . . . . . . . . . . . . 254 operating with certified Names operating with URIs operating with IDs 254 259 264 21. operating with different XML elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 XML reviews Processing directions files textual content Nodes XML Entity and personality References CDATA Sections 267 269 272 274 278 280 22. extra XQuery-Related criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282 Serialization XQueryX XQuery replace Facility Full-Text seek XQuery API for Java (XQJ) 282 284 285 285 287 23. Implementation-Specific gains . . . . . . . . . . . . . . . . . . . . . . .

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