The blocking constraint must not contain substitution for an element declaration to be validly substituteable for another element declaration. In the test any substitution for element Head is disallowed.
http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#cElement_Declarations
TEST disallowedsubst00301m2 - substitution is disallowed (valid schema)
| Item | Value | 
|---|---|
| title | disallowedsubst00301m2 - substitution is disallowed (valid schema) | 
| name | disallowedsubst00301m2 | 
| source | ../disallowedSubst00301m2.xsd | 
| schemaName | ../disallowedSubst00301m2.xsd | 
| executeClass | com.sun.jaxb_tck.sigtest.JAXBTest | 
| executeArgs | -TestURL $testURL -Plugin com.sun.jaxb_tck.sigtest.JaxbPlugin -FileName disallowedsubst00301m2.sig -PackageWithoutSubpackages $package | 
| keywords | schema positive | 
| package | javasoft.sqe.tests.elemdecl.disallowedsubst.disallowedsubst00301m.disallowedsubst00301m2 | 
| signature | disallowedsubst00301m2.sig |