Viewing Schemas in XML Tools
The schema was generated from the XHTML DTD we created in Chapter 5. You can open XHTMLschema.xsd in XML Authority version 1.2 or higher.
Because schemas are written as well-formed XML documents, you can also view the schema in any other XML tools, such as XML Spy or Microsoft XML Notepad. For example, Figure 7-1 shows the schema as it would appear in XML Spy.
Figure 7-1. The schema in XML Spy.
As you can see in Figure 7-1, a schema has a well-defined structure. This structure includes a root element named schema, with one or more element child elements. These element elements can have complexType child elements; the complexType elements can in turn have annotation, group, attributeGroup, and attribute child elements. Clearly, this schema is a well-formed XML document.