Fixed dummy element entry in elements.xml.

[dsondak]

elements.xml allowed for the creation of a dummy element but the dummy element tag was incomplete. Trying to use the dummy element caused cantera to throw an exception:

CanteraError thrown by LookupWtElements:
element not found

I updated the dummy element tag and the exception is no longer thrown.

Another strange behavior is that if the user sets atomicWt = "0.0" in the dummy element, then cantera throws the same exception as before. Right now, I set atomicWt = "1.0E-16" which works. Maybe cantera is trying to require positive atomic weights in which case a different error message may be more informative.

[speth]

I'm actually unclear on what the purpose of having a dummy element defined in elements.xml is. If you want to define your own element, for whatever purpose, that can be done in any user-created CTI/XML file. My inclination would just be to remove this entry, since it obviously can't be used as-is.

The reason that setting the atomic weight to zero is because zero is currently (unfortunately) being used as the default value to trigger lookup from the list of real elements. It will take a little thought to figure out how to fix this without breaking any existing input files.

[dsondak]

The dummy element has been completely removed from elements.xml now.

I am also not sure why the dummy element was there in the first place. We found it convenient for our purposes and so decided to use it. Of course, it is not a big deal to define our own element in the XML input file.

Thanks for the quick reply!