Plural form of 'schema'

Question

Schema appears to have two plural forms that are both valid: schemata and schemas. Are they completely interchangeable; or are there any guidelines on which one is appropriate for particular contexts?

Answer 1

The Greek schemata is mostly found in academic writing (e.g. experimental schemata), whereas the anglicized schemas is used freely in both technical and more general discourse (e.g. database access schemas).