A feature unique to Spin is the use of blocks. Objects can contain six kinds of blocks: CON, VAR, PUB, PRI, OBJ, and DAT. Each block has its own syntax and allowed keywords, like little mini-languages of their own.
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CONstant: define values that cannot be changed.
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VARiable: define values that can be changed.
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PUBlic: declare public functions.
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PRIvate: declare private functions.
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OBJect: include other objects for use by the current one.
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DATa: include arbitrary data in your object.