Haar Cascade XML

I am interested in what everything in the xml file below means:

<stages>
<trees>
<feature>
<rects>
<_>
<tilted>
<threshold>
<left_val>
<right_val>

and what the five integers in between rects mean.

        <feature>
          <rects>
            <_>
              14 18 1 2 -1.</_>
            <_>
              14 19 1 1 2.</_></rects>
          <tilted>0</tilted></feature>
        <threshold>-4.3883759644813836e-005</threshold>
        <left_val>0.3130159080028534</left_val>

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