What does rename-to mean in the module tag of a GWT module?

What does the rename-to attribute of the module tag in a GWT module mean? Is it optional开发者_Python百科?

It "causes the compiler to behave as though the module had a different name than the long, fully-qualified name" (http://code.google.com/webtoolkit/doc/latest/DevGuideOrganizingProjects.html). Yes, it's optional, and indeed only recommended for limited use cases.