The following class dictionary is not LL1.

SchemaItem	: 
		  Annotation |
		  Attribute |
		  SequenceGroup |
		  Comment
		  .

Annotation	= "<" [ <prefixS> NSRef ] "annotation>".
Attribute	= "<" [ <prefixS> NSRef ] "attribute".
SequenceGroup	= "<" [ <prefixS> NSRef ] "sequence".
Comment		= "<!--" <comment> String "-->".

NSRef		= <namespace> Ident ":".

The following class dictionary defines the same language
and is LL1. Find the UNKNOWNs.

SchemaItem	: 
                  AAS |
		  Comment
		  .

AAS = "<" [ <prefixS> NSRef ] Rest.
Rest :
		  AnnotationR |
		  AttributeR |
		  SequenceGroupR .

AnnotationR	= "annotation>".
AttributeR	= "attribute".
SequenceGroupR	= "sequence".
Comment		= "<!--" <comment> String "-->".

NSRef		= <namespace> Ident ":".