title: What's the tags meaning of Stanford dependency parser(3.9.1)?
body: <p>I used the Stanford dependency parser(3.9.1) to parse a sentence, and I got the result as the following. </p>
  
  <pre><code>    [[(('investigating', 'VBG'), 'nmod', ('years', 'NNS')),
    (('years', 'NNS'), 'case', ('In', 'IN')),
    (('years', 'NNS'), 'det', ('the', 'DT')),
    (('years', 'NNS'), 'amod', ('last', 'JJ')),
    (('years', 'NNS'), 'nmod', ('century', 'NN')),
    (('century', 'NN'), 'case', ('of', 'IN')),
    (('century', 'NN'), 'det', ('the', 'DT')),
    (('century', 'NN'), 'amod', ('nineteenth', 'JJ')),
    (('investigating', 'VBG'), 'nsubj', ('Planck', 'NNP')),
    (('investigating', 'VBG'), 'aux', ('was', 'VBD')),
    (('investigating', 'VBG'), 'dobj', ('problem', 'NN')),
    (('problem', 'NN'), 'det', ('the', 'DT')),
    (('problem', 'NN'), 'nmod', ('radiation', 'NN')),
    (('radiation', 'NN'), 'case', ('of', 'IN')),
    (('radiation', 'NN'), 'amod', ('black-body', 'JJ')),
    (('radiation', 'NN'), 'acl', ('posed', 'VBN')),
    (('posed', 'VBN'), 'advmod', ('first', 'RB')),
    (('posed', 'VBN'), 'nmod', ('Kirchhoff', 'NNP')),
    (('Kirchhoff', 'NNP'), 'case', ('by', 'IN')),
    (('Kirchhoff', 'NNP'), 'advmod', ('earlier', 'RBR')),
    (('earlier', 'RBR'), 'nmod:npmod', ('years', 'NNS')),
    (('years', 'NNS'), 'det', ('some', 'DT')),
    (('years', 'NNS'), 'amod', ('forty', 'JJ'))]]
  </code></pre>
  
  <p>Some of the tags meaning such as 'nmod' and 'acl' are missing in the <a href="https://nlp.stanford.edu/software/dependencies_manual.pdf" rel="nofollow noreferrer">StanfordDependencyManual</a>.The newest manual version I can find is 3.7.0. I also find some explanation at a <a href="https://wiki.opencog.org/w/Dependency_relations#Standard_list_of_dependency_relations" rel="nofollow noreferrer">Standard_list_of_dependency_relations</a>
  But it still missed some tags. </p>
  
  <p>Hence, my question is where can I find the newest version of the explanation of these tags? Thanks!</p>