In YARD 0.4.0, the ability to automatically load YARD "plugins" (essentially gems beginning with yard_ or yard- prefix) was added. Once loaded, the new Handler classes within a plugin can be used by YARD to recognize meta-programming statements and register new method-names/classes accordingly.
Currently, the yard-dm plugin should handle most DataMapper code-bases. Although, I know their is still some edge-case syntax not yet supported for the "has" statements.
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