As I Lay Dying are metalcore, thus belong to the "-core" group, which doesn't count as metal. Wikipedia should help you out on the topic of extreme metal as it basically lists what belongs under that umbrella term.
However, note that Wikipedia isn't always a 100% correct on certain topics. If you're not sure what genre a certain band belongs to, you could always try Google you know. Mostly they'll come up with some nice, quite accurate results.
Anyway, here is what we put under black/trash metal:
Ketzer - Warlust
Quote:Extreme metal is a loosely defined umbrella term for a number of related heavy metal music subgenres that have developed since the early 1980s. The term usually refers to a more abrasive, harsher, underground, non-commercialized style or sound nearly always associated with genres like black metal, death metal, doom metal, thrash metal
However, note that Wikipedia isn't always a 100% correct on certain topics. If you're not sure what genre a certain band belongs to, you could always try Google you know. Mostly they'll come up with some nice, quite accurate results.
Anyway, here is what we put under black/trash metal:
Ketzer - Warlust