Although the parser only derives projective graphs , the fact that graphs are labeled allows non-projective dependencies to be captured using the pseudoprojective approach of Nivre and Nilsson ( 2005 ) .
pseudoprojective dependency parsing
J Nivre J Nilsson
â¢ LEFT-ARC ( r ) : Add an arc labeled r from next to top ; pop the stack . Although the parser only derives projective graphs , the fact that graphs are labeled allows non-projective dependencies to be captured using the pseudoprojective approach of Nivre and Nilsson ( 2005 ) . Another limitation of the parsing algorithm is that it does not assign dependency labels to roots , i.e. , to tokens having HEAD = 0 .
Although the parser only derives projective graphs , the fact that graphs are labeled allows non-projective dependencies to be captured using the pseudoprojective approach of @@CITATION .