In the publishSchemaImports method, the code that prevent infinate loops should continue to the next item in the list instead of returning from the function. The following scenario would prematurely stop

Schema2.xsd
– Import Schema3.xsd

Schema1.xsd
– import Schema2.xsd
– import Schema3.xsd
– Import Schema4.xsd
.....
– Import SchemaN.xsd

In this schenario, Schema4.xsd - SchemaN.xsd wouldn't be published