Simple API for XML (SAX)
SAX stands for Simple API for XML - SAX is an XML standard used everywhere in Stylus Studio, for parsing and building representations of XML documents.
DTD vs. Schema
Stylus Studio provides tools for working with both W3C XML Schema and DTD's - this tutorial explains what the differences are between the two, providing a technical comparison of DTD vs Schema.
EDIFACT Reference
The EDIFACT Reference is a free developer resource providing the most in-depth information on EDIFACT constructs and data models.