AM CoNLL file format

The AM parser internally represents derivations of graphs as AM dependency trees. These can be written in a file in the AM-CoNLL file format, which is a variant of the usual CoNLL(-U) format for syntactic dependency trees.

The columns have the following meanings:

Column	Meaning	Corresponding CoNLL-U column
1	ID (position in sentence)	1 ID
2	FORM (exact word form)	2 FORM
3	REPLACEMENT (_name_, UNK, etc.); _ if no replacement needed	--
4	LEMMA	3 LEMMA
5	POS	4 UPOS
6	NER: named entity tag, or O if none	--
7	delexicalized supertag	--
8	lexical label (for relexicalizing the supertag)	--
9	type (not included in delexicalized supertag)	--
10	HEAD (head ID, 0 if no head)	7 HEAD
11	DEPREL (incoming edge label)	8 DEPREL
12	aligned (true or false)	--

Every line that starts with # is a comment and can be ignored. For some purposes sentences can have additional attributes (like raw untokenized sentence) then we add a line with the format #[key]:[value]. For instance:

#raw:New York is great!

Unparsed AM-CoNLL files (which serve as input to the AM parser) only have meaningful values in columns 1-6, and blank values in the other columns. The AM parser will then output another AM-CoNLL file with the other columns filled in.