[osis-core] attribute type values

[Troy A. Griffitts]

I would like some opinions on the best way to mark a few anomalies. 
I'll post my best attempt below, which should give the idea what I'm 
trying to mark.

1:
---------
<seg type="x-ntOccuranceCount:7">There are seven occurances in the New 
Testament</seg>
---------

2:
---------
<work osisWork="scriv">
<title>Scriveners Greek New Testament</title>
</work>
<work osisWork="steph">
<title>Stephanus Greek New Testament</title>
</work>
...
<seg type="x-variant:scriv">AUTW</seg><seg type="x-variant:steph">PROS 
AUTON</seg>
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