[XeTeX] invalid character "^" and jtree

[Joshua and Amy]

I'm using Pr. Frampton's pst-jtree package, and I want to create a tree with
3 sister nodes. The code I'm using is this:

\jtree
\! = {poem}
    <left>{line} ^<vert>{line} ^<right>{line}.
\endjtree

In the console I'm getting

! JTREE ERROR: INVALID ITEM.
\jtp at err #1->\errmessage {JTREE ERROR: #1}

l.553 <left>{line} ^<
                     vert>{line} ^<right>{line}.
?

My suspicion is that it's related to my using XeTeX. Any thoughts on this?

Josh Jensen
UT Arlington Linguistics & TESOL
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