Meaning of sentence in the context

Question

Note the text below is technical (programming).

The function main shall not be used within a program. The linkage (3.5) of main is implementation-defined. A program that defines main as deleted or that declares main to be inline, static, or constexpr is ill-formed. The name main is not otherwise reserved. [ Example: member functions, classes, and enumerations can be called main, as can entities in other namespaces. — end example ]

I'm trying to understand meaning of highlited sentence. Can I mention it as

there is no more restrictions applied to the main, except are noted above.

UPD:

I will have cited the definition in my understanding.

function::= is a block of instruction to be executed.

main function::= It can be mention as abstract function at the point of previous definition.

linkage::= I can cite a definition of this concept, but it contains terms which are required a definition themselves.

inline, static, constexp::= modifiers which can be applied to any function.

member function, classes, etc::= Entities of the programming languages which I'm considering. It can be mentioned as "building blocks" of a program.

Also, I think that there is no need to provide a definition of program. :)

Answer 1

I'm not exactly sure what your interpretation is trying to say. You are correct to say that there are no restrictions on "main" other than the ones noted earlier.

However, in the context of a programming language, "reserved word" has a specific meaning. If a word is reserved, it can't be used as a name for anything. I believe this is saying that within the specified programming language, it is legal to use the word "main" as the name for things that are not functions. So, as your examples say, you are allowed to use the word "main" to name a class, a variable, an enum, etc. You just can't call a function "main".