Custom Formating

I was wondering how I would create a custom formats instead of sticking to IEEE, Harvard, ect.

I’ve noticed that under “papercite\format\ieee.tpl” that it’s controlled by this:

@?author@@author@, @;@@?title@"@title@@;@@?journal||volume||number||pages||year@," @:@." @;@@?journal@<span style="font-style: italic">@journal@</span>@;@@?volume@, vol. @volume@@;@@?number@, iss. @number@@;@@?pages@, @?#pages>1@pp. @:pages@p. @;pages@@pages@@;@@?year@, @year@@;@@?journal||volume||number||pages||year@.@:@@;@

but I don’t seem to understand the language. Is there a tutorial or documentation?