(r5rs.info.gz) Primitive; library; and optional features

(r5rs.info.gz) Notation and terminology

(r5rs.info.gz) Error situations and unspecified behavior

 
 1.3.1 Primitive; library; and optional features
 -----------------------------------------------
 
 It is required that every implementation of Scheme support all features
 that are not marked as being "optional".  Implementations are free to
 omit optional features of Scheme or to add extensions, provided the
 extensions are not in conflict with the language reported here.  In
 particular, implementations must support portable code by providing a
 syntactic mode that preempts no lexical conventions of this report.
 
 To aid in understanding and implementing Scheme, some features are
 marked as "library". These can be easily implemented in terms of the
 other, primitive, features.  They are redundant in the strict sense of
 the word, but they capture common patterns of usage, and are therefore
 provided as convenient abbreviations.

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