|   | Section 6.3: |  | 
 
The features of abstract classes are all expressed as method signatures - either as a routine or as an iter. This section specifies the common concrete syntax only. All abstract syntax and semantics are specified under sub-section 6.3.2 (iters) or sub-section 6.3.1 (routines).
The abstract syntax and static semantics associated with a method signature are given in the iter and routine sub-sections. There can, of course, be no dynamic semantics as these features are merely signatures.
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