Thanks R0j0 for the answer!
There are 2 types. percent and float.
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Original question
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<!-- Parameters -->
<parameters>
<param>
<name>Threshold</name>
<description>Separation level, from 0 to 100.</description>
<type>percent</type>
<initial>0.5</initial>
<uniform>threshold</uniform>
</param>
</parameters>
I am curious under type percent what other options do I have. And why the heck isn't there documentation on this lol? Are the same possibilities available as with the rest of the sdk?