One important concept established through research of persistent programming languages is orthogonal persistence. The techniques so far proposed for this concept are, however, limited to single language systems. This paper proposes a systematic method to achieve orthogonal persistence in a multilanguage system by combining a technique for higher-order remote procedure calls and a mechanism of orthogonal persistence in a single language system. The proposed method can be used to develop a multilanguage persistent type system, where any data of any types including higher-order functions can persist and can later be used from a different language. The necessary data conversion between languages is transparent to the user. In addition to an effective algorithm to implement a multilanguage persistent system, the authors system has rigorous type discipline and formal properties that enable them to show that multilanguage sharing preserves the intended semantics of persistent data.
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