Thank you all for the fantastic replies. I thought Inline was a very interesting bit of Perl. I also appreciate the pointers towards perl4caml and CamelBones.
The question came out so vague because I was simply curious about the issue of how various languages played nice with one another. Solutions that I already knew about include setting up XML-RPC, SOAP, or some other interface that's interoperable between languages. I know almost nothing about XS, but I think that's the solution I was more interested in.
I originally thought of the question when I was going through some particularly nasty legacy perl code. I thought the code was perfect for a basic CRUD webapp in Rails. However, since there were many other legacy systems that depended on the legacy code, I wanted to make a Ruby interface to the legacy code, and use that Ruby interface in the webapp. Wrapping around the legacy code would allow me to design away all the years of hacks and be able to test it at the same time.
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