The definitive catalog is available online from FIA/CIVA at:http://www.fai.org/aerobatics/catalog/Default.htm
which will help a bit in decoding Aresti, once you get a rough idea of how the symbols work.
The way it works is that you get the "Form A" which accompanies the Form B and Form C (pictures for wind in each direction) and you can go to the catalog above and figure out exactly what each maneuver is.
For example, here's the Sportsman IAC 2002 Known Form A:
Maneuver 1 is a Loop (7.5.1) which if we look at Family 7 of the Catalog (Loops and Eights) is a vanilla, inside loop, because the line is drawn solid. If the aircraft is to be upside down (negative G) the line is drawn dashed, as we can see in 7.5.2, which is a plain outside loop.
If you check Guenther's website at:
http://acro.harvard.edu/ACRO/faq_aerobatics.html
it will probably have more helpful information, too.