The Revised[6] Report on the Algorithmic Language Scheme
The Scheme language is standardized in the official IEEE standard and a de facto standard called the Revised Report on the Algorithmic Language Scheme. The most widely implemented standard is R5RS (1998); a new standard, R6RS, was ratified in 2007. Scheme has a diverse user base due to its compactness and elegance, but its minimalist philosophy has also caused wide divergence between practical implementations, so much that the Scheme Steering Committee calls it the world's most unportable programming language and a family of dialects rather than a single language.
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