How to fix Eclipse validation error “No grammar constraints detected for the document”?

Question

Eclipse 3.5.2 is throwing an XML schema warning message:

No grammar constraints (DTD or XML schema) detected for the document.

The applica

Answer 1

What I found worked for me was to remove the schemaLocation attribute completely then right click in the outline view and goto edit namespaces, then adding the schema location hint into the resulting dialog.