[erlang-questions] module_info

[Saifi Khan]

Hi:

Started working through the 'Getting started with Erlang' examples.

There are two module_info functions that seem to be defined
for every module.
 module_info/0  
 module_info/1

What is the purpose of module_info function ?

On invocation the following info is shown for example
2> tut:module_info().
[{exports,[{double,1},{module_info,0},{module_info,1}]},
 {imports,[]},
 {attributes,[{vsn,[273405249567272843094678604656701543356]}]},
 {compile,[{options,[]},
 {version,"4.4.4"},
 {time,{2007,5,19,14,5,5}},
 {source,"/data/code/tut.erl"}]}]

What is the interpretation of the vsn entry in the attributes field ?
There is a very large number there. What is its purpose ?

Appreciate if the experienced erlangers share their thoughts.

thanks
Saifi.

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