The Enterprise Mashup Markup Language uses a distinct namespace for updated versions of its schema. In many cases, the language is backwards compatible, mashup scripts from previous versions still work as expected.

Prestoalso defines extensions to EMMLwhich use the PrestoMashup Extension namespace. Custom statements that you define for your mashups as EMML macros use the macro reference namespace.

The EMML, Presto extension and macro namespaces that are currently supported include:

Mashup scripts or macro libraries from earlier versions and namespaces may no longer function and should be migrated to the current version of the schema.