Qus: What is the difference between Schema and SchemaDT?
Schema is nothing but a structure of document, we can generate "Document Type" from Schema, and it’s called SchemaDT.
We can say Schema is a blue print. We can create "Document Type" separately, it is containing fields, but here we have to add fields manually.
Schema is a flat file schema. schemaDT is a IS Document Type created/generated from this schema.