XQuery Editor
Stylus Studio's XQuery development tools are a tremendous help in building and testing XML applications requiring a standards-based approach to querying, integrating and transforming data from various distributed data sources.
XML Schema Validation
Validate XML using XML Schema with MSXML, XERCES, XSV, SYSTEM.XML, & other XSD Validators. Stylus Studio's XML Schema-Aware XML Editing makes XML Schema Validation a snap!
OASIS Catalog Support
Stylus Studio's features for working with OASIS catalogs allow you to incorporate any vendor's catalog - or one of your own - in your XML, making writing correct and robust XML easier than ever.
XQuery Functions - User Defined Functions in XQuery
Dr. Michael Kay's tutorial entitled: 'Defining your own Functions in XQuery' explains how to write powerful User Defined Functions in XQuery.