Chapter 4 Schema composition
We tend to think of schemas as individual XML documents. However, in XML Schema terminology, these are actually schema documents. Schemas can be composed of one or more schema documents. This chapter explains how schema documents are assembled into a schema through various mechanisms, including mechanisms built into XSDL and processor-specific handling.
4.1 Modularizing schema documents
Consider a project that involves orders for retail products. The order will contain information from several different domains. It will contain general information that applies to the order itself, such as the order number and date. It may also contain customer information, such as customer name, number, ...