Parse of a top level schema document.
Parse of s1 <xs:schema targetNamespace=“t1”>
Parse of s1 <xs:include schemaLocation=“s3.xsd”>
Parse of s3 <xs:schema targetNamespace=“t1”>
Parse of s3 <xs:element name=“t1e2” type=“xs:string”/>
Parse of s1 <xs:import namespace=“t2” schemaLocation=“s2.xsd”/>
Parse of s2 <xs:schema targetNamespace=“t2”/>
Parse of s2 <xs:element name=“t2e1” type=../>