Main Entry Defined
"Specific Entry giving maximum information about the whole of a document. All the other entries: specific or general relating to the document, are normally derived from the Main Entry".
In the above statement Ranganathan used the terms specific and general entries. You will have to note that according to Ranganathan when a catalogue entry mentions a specific document it is a specific entry. But if the entry does not mention any specific document it is called general entry.
Ranganathan divides added entries into two broad groups as General Added Entries and Specific Added Entries. From the illustration given you can see how a main entry looks like.