A very clear and accurate analysis of both Mediterranean and non-Mediterranean ports is required.
1	A	a	DET	IND-SG	Definite=Ind|PronType=Art	6	det	_	_
2	very	very	ADV	_	_	3	advmod	_	_
3	clear	clear	ADJ	POS	Degree=Pos	6	amod	_	_
4	and	and	CCONJ	_	_	5	cc	_	_
5	accurate	accurate	ADJ	POS	Degree=Pos	3	conj	_	_
6	analysis	analysis	NOUN	SG-NOM	Number=Sing	14	nsubj:pass	_	_
7	of	of	ADP	_	_	12	case	_	_
8	both	both	CCONJ	_	_	9	cc	_	_
9	Mediterranean	mediterranean	ADJ	POS	Degree=Pos	12	amod	_	_
10	and	and	CCONJ	_	_	11	cc	_	_
11	non-Mediterranean	non-mediterranean	ADJ	POS	Degree=Pos	9	conj	_	_
12	ports	port	NOUN	PL-NOM	Number=Plur	6	nmod	_	_
13	is	be	AUX	PRES-AUX	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	14	aux:pass	_	_
14	required	require	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	SpaceAfter=No
15	.	.	PUNCT	Period	_	14	punct	_	_
