XML tags are case-sensitive.
1	XML	XML	PROPN	SG-NOM	Number=Sing	2	compound	_	_
2	tags	tag	NOUN	PL-NOM	Number=Plur	4	nsubj	_	_
3	are	be	AUX	PRES	Mood=Ind|Tense=Pres|VerbForm=Fin	4	cop	_	_
4	case-sensitive	case-sensitive	ADJ	POS	Degree=Pos	0	root	_	SpaceAfter=No
5	.	.	PUNCT	Period	_	4	punct	_	_
