The declaration is optional but is recommended in any XML document.
1	The	the	DET	DEF	Definite=Def|PronType=Art	2	det	_	_
2	declaration	declaration	NOUN	SG-NOM	Number=Sing	4	nsubj	_	_
3	is	be	AUX	PRES	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
4	optional	optional	ADJ	POS	Degree=Pos	0	root	_	_
5	but	but	CCONJ	_	_	7	cc	_	_
6	is	be	AUX	PRES-AUX	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	aux:pass	_	_
7	recommended	recommend	VERB	PASS	Tense=Past|VerbForm=Part|Voice=Pass	4	conj	_	_
8	in	in	ADP	_	_	11	case	_	_
9	any	any	DET	IND	_	11	det	_	_
10	XML	XML	PROPN	SG-NOM	Number=Sing	11	compound	_	_
11	document	document	NOUN	SG-NOM	Number=Sing	7	obl	_	SpaceAfter=No
12	.	.	PUNCT	Period	_	4	punct	_	_
