Linking segs and interps:

Some attributes take special values:
ID: a unique value, which identifies one particular element in your xml file.

IDREF: a value that must correspond to an ID somewhere else in the document. The value refers or points to an element defined by an ID
<seg>'s are linked to <interp>'s through ID and IDREF attribute values. The "id" attribute on the <interp>s takes an ID value, and the "ana" attibute on <seg>s takes an IDREF.

Example:
In the main body of the text:

<seg type="Love Theme" ana="QuietLove">READER, I married him. A quiet wedding we had: he and I, the parson and clerk, were alone present.</seg> When we got back from church, I went into the kitchen of the manor-house, where Mary was cooking the dinner, and John cleaning the knives, and I said --

...

In the back matter:
<interpGrp type="Love Theme" resp="Scott Hamlin">
<interp id="QuietLove" value="quiet intimate love"/>
<interp id="BlindLove" value="blind unquestioning love"/>
<interp id="MadLove" value="mad passionate love"/>
</interpGrp>