New to iApp

I was going through labs on iApp. I have multiple queries

presentation { include "/Common/my_apl_common"

section virtual { ip_and_port vs_info <============ "ip_and_port" is this predefined field ? If so where do i get the list of predefined fields. yesno attach_pool } optional ( virtual.attach_pool == "Yes" ) { section pool { lb_method lb <=== Same here. simple_pool_members servers } }

Besides, where do I get the list of methods to call. For example:

my_app_utils:create_http_vs <========== my_app_utils:create_pool <============

Thanks.