torelli sonata in d major, mvt 2

this allegro movement is the second of four in guiseppe torelli's trumpet sonata in d major.
it begins with solo trumpet playing the expository line, followed by a fugue-like introduction in the high strings and later in the low strings. the next entrance from the trumpet sounds sequential since it is the same melody, only modified by being in a different key. again, the strings enter follwing the trumpet melody as if playing a fugue. each melodic line sounds like a period because it ends in a half cadence when the first phrase ends, and a pac when the second ends. this movement does not have much depth--not much of a discernable structure or form like movements 1 and 4. perhaps it has something to do with the fact that it is an inner movement. but seriously, the same melodic motive is repeated over and over again througout the piece, and the only developmental section i hear occurs when the motive is played in sequence.