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Re: :: notation

Andrew Moylan wrote:

>What are the properties of the :: notation? As in the following:
>function::usage = "bla";
>Where can I read about this notation in the documentation?
If you want to find the FullName of a particular notation, one method is 
to wrap an example of the notation in Hold and look at its FullForm:

In[227]:= Hold[a::b] // FullForm
Out[227]//FullForm= Hold[MessageName[a,"b"]]

We discover that the FullForm version of :: is MessageName, which you 
can then look up in the help.

Carl Woll
Wolfram Research

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