"RDBMS" does not necessarily imply that it speaks SQL, correct? My company produces document clustering software that can interact with virtually any database

"RDBMS" does not necessarily imply that it speaks SQL, correct? My company produces document clustering software that can interact with virtually any database (via ODBC) that speaks SQL to examine any stored documents and cluster them. It is extremely annoying to try to convey to a prospective customer that it works with "virtually any SQL server" without them thinking that means just Microsoft SQL Server. I agree with guard-of-terra -- we should not be ceding common/descriptive terms to Microsoft.