Doc group

The Doc group represents the whole XML instance document.

This includes the Prolog of the document and the top-level element of the instance document - ElementDecl group of the Person element.

In preceding image, the example has only one global element declared in the schema (Person). For that reason it is directly included in the Doc group.

If more than one global element was declared in the schema, a choice group named Global would be defined as a choice selection for the elements because the XML instance document must have only one root element. In that case, this Global group would be included in the Doc group along with Prolog.