详情请参考官网：http://www.erlang.org/doc/reference_manual/records.html
http://www.erlang.org/doc/programming_examples/records.html
1. record本质上是tuple.
2.获取record的结构相关的信息的函数：
To each module using records, a pseudo function is added during compilation to obtain information about records:
record_info(fields, Record) -> [Field] record_info(size, Record) -> Size
Size is the size of the tuple representation, that is one more than the number of fields.
In addition, #Record.Name returns the index in the tuple representation of Name of the record Record. Name must be an atom.
原文：http://www.cnblogs.com/ribavnu/p/3714131.html