Finally went and looked at the spec ... note this is SLD1.0 so we may 
need to ask someone with access to SLD1.1 RasterSymbolizer definition to 
look to see if anything has changed for us.
> The interpretation of Geometry is system-dependent, as raster data may 
> be organized
> differently from feature data, though omitting this element selects 
> the default raster-data
> source. Geometry-type transformations are also system-dependent and it 
> is assumed that
> this capability will be little used. Opacity has the usual meaning. 
> The meanings of the
> other parameters are described with their element definitions. Default 
> values are system
> or data dependent.
The elements for RasterSymbolizer are:
- sld:Geometry
- sld:Opacity
- sld:ChannelSelection
- sld:OverlapBehavior
- sld:ColorMap
- sld:ContrastEnhancement
- sld:ShadedRelief
- sld:ImageOutline

The only contact with real data seems to be provided by ChannelSelection:
> <ChannelSelection>
> <RedChannel>
> <SourceChannelName>1</SourceChannelName>
> <ContrastEnhancement>
> <Histogram/>
> </ContrastEnhancement>
> </RedChannel>
> ...
> </ChannelSelection>
Where the SourceChannelName is:
> Commonly, channels will be labelled as“1”, “2”, etc.
Comments,
Jody

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