TagSet
 Usage
• f/: lhs = rhs assigns rhs to be the value of lhs, and associates the assignment with the symbol f.
Notes
• TagSet defines upvalues or downvalues as appropriate. • The symbol f in f/: lhs = rhs must appear in lhs as the head of lhs, the head of the head, one of the elements of lhs, or the head of one of the elements. • A common case is f/: h[f[args]] = rhs. • You can see all the rules associated with a particular symbol by typing ?symbol. • If f appears several times in lhs, then f/: lhs = rhs associates the assignment with each occurrence. • When it appears in symbolic form, TagSet is treated as a scoping construct (see Section A.3.8). • New in Version 1.
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