OGC filters allow syntax like this:
<Filter>
<PropertyIsEqualTo>
<Function name="SIN">
<PropertyName>DISPERSION_ANGLE</PropertyName>
</Function>
<Literal>1</Literal>
</PropertyIsEqualTo>
</Filter>
However the OpenLayers comparison filters appear to require a propertyName,
so it's not possible to encode this.
I was going to go ahead and make the change to my copy to support this
(either propertyName or function is required for first child), but I wanted
to see if I was missing something.
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