Download XQuery (2nd Edition) by Priscilla Walmsley PDF

By Priscilla Walmsley

The W3C XQuery 3.1 typical offers a device to look, extract, and control content material, no matter if it's in XML, JSON or undeniable textual content. With this absolutely up to date, in-depth educational, you'll discover ways to software with this hugely useful question language.

Designed for question writers who've a few wisdom of XML fundamentals, yet no longer unavoidably complex wisdom of XML-related applied sciences, this ebook is perfect as either an academic and a reference. You'll locate historical past details for namespaces, schemas, integrated kinds, and usual expressions which are suitable to writing XML queries.

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Additional resources for XQuery (2nd Edition)

Example text

It’s not meaningful (or possible) to ask whether "abc" and "abc" are the same string or different strings; you can only ask whether they are equal. info Sequences Sequences are ordered collections of items. A sequence can contain zero, one, or many items of any kind. For example, you could have a sequence of atomic values, or a sequence of nodes, or a sequence that contains both atomic values and nodes. The most common way that sequences are created is that they are returned from expressions or functions that return sequences.

A sequence can contain zero, one, or many items of any kind. For example, you could have a sequence of atomic values, or a sequence of nodes, or a sequence that contains both atomic values and nodes. The most common way that sequences are created is that they are returned from expressions or functions that return sequences. xml")/catalog/product returns a sequence of four items, which happen to be product element nodes. A sequence can also be created explicitly using a sequence constructor. The syntax of a sequence constructor is a series of values, delimited by commas, surrounded by parentheses.

However, they have a limitation: they can only return elements and attributes as they appear in input documents. Any elements selected in a path expression appear in the results with the same names, the same attributes and contents, and in the same order as in the input document. When you select the product elements, you get them with all of their children and with their dept attributes. Path expressions are covered in detail in Chapter 4. FLWORs The basic structure of many (but not all) queries is the FLWOR expression.

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