[ome-devel] LogicalChannel ST vs ChannelInfo XML element

[Curtis Rueden]

I have been working on a Java implementation of some classes for easily 
parsing OME-XML files. I am implementing all the ome-java interfaces 
from org.openmicroscopy.ds.dto and org.openmicroscopy.ds.st, except that 
instead of querying a database, using criteria, being backed by a Map, 
etc., each implementating class is backed by an org.w3c.dom.Element 
object (an element of a DOM structure). The implementation just provides 
a thin wrapper layer around the DOM to make traversal easier (following 
ID references, etc.).

I am almost done, but I am confused about LogicalChannels. At first, I 
did not understand why the class was called LogicalChannel when it 
seemed to refer to the ChannelInfo element from ome.xsd. So I 
implemented all the methods assuming a backing ChannelInfo DOM element. 
But when trying to implement some of 
org.openmicroscopy.ds.st.LogicalChannel's methods 
(getAuxLightWavelength, getAuxTechnique, getAuxLightAttentuation, etc.) 
I noticed those fields are not part of ChannelInfo. I searched for STs 
containing these terms and hit upon the LogicalChannel ST in 
Core/Image.ome. A lot of the ChannelInfo fields are duplicated in this ST.

So now I'm confused. Can an OME file have the overlapping information 
stored either within a ChannelInfo element, or under CustomAttributes as 
part of a LogicalChannel element? Or is one of these two constructs 
obsolete?

Thanks,
Curtis