Link: http://www.stylusstudio.com/xquery_flwor.html
Source Author or Organization: Stylus Studio

FLWOR stands for "For, Let, Where, Order by, and Return" - it's an important XQuery construct for working with XML data in XQuery. The XQuery FLWOR tutorial is written by Dr. Michael Kay and covers the following topics:

• Simple XQuery FLWOR Examples
• The relationship between FLWOR expressions and XPath expressions
• The syntax of an XQuery FLWOR Expression
• Executing a FLWOR expression to query an XML file
• Using 'Variables' in XQuery
• Troubshooting XQuery FLWOR expressions
• Ordering in XQuery
• XQuery Return values
• Declaring XQuery types
• Grouping in XQuery
• Common XQuery functions
• Visually defining XQuery FLWOR blocks with the Stylus Studio XQuery Mapper

This tutorial on XQuery FLWOR is Dr. Michael Kay's second installment in a series of XQuery articles which included an XQuery primer entitled: "Learn XQuery in 10 Minutes" and a tutorial about Schema Awareness entitled: "Schema-Aware Queries and Stylesheets".