XQuery Kick Start

Chapter 7. Understanding XQuery Semantics

by Vaidyanathan Nagarajan

IN THIS CHAPTER

• XQuery Semantics Introduction

• Processing Model for XQuery

• Differences Between XQuery and XQuery Core

• XQuery Data Model

• Schemas and Types

• Functions

• Notation

• Expression of Semantics in XQuery

• Type Level

• Function Semantics

• In Brief

XQuery Semantics Introduction

XQuery is a functional language (the language is built around functions). Each query is equivalent to an expression. In layman's terms, you can view XQuery as a SQL equivalent used for querying XML documents. From a traditional programming language course perspective, it is better to have a grasp of the syntax and semantics of the language. Semantics is the study of meaning in a language; knowing the semantics can help you ...