xml gra tiers

[Paul Feitzinger]

I noticed the most recent XML files available online (at least in
Valian, Brown and MacWhinney) have their gra tiers isolated in one <a>
node per utterance

  <a type="extension" flavor="gra">1|0|ROOT 2|1|PUNCT</a>

while chatter still produces XML files with per-word <gra> nodes.

Will the xml files return to the <gra> node format or is this an
intentional change?

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