[Bug 586] New: - resolve validation problem with missing keys

[bugzilla-daemon@ecoinformatics.org]

http://bugzilla.ecoinformatics.org/show_bug.cgi?id=586

           Summary: resolve validation problem with missing keys
           Product: EML
           Version: 2.0
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: eml - general bugs
        AssignedTo: jones at nceas.ucsb.edu
        ReportedBy: jones at nceas.ucsb.edu
         QAContact: jones at nceas.ucsb.edu
                CC: eml-dev at ecoinformatics.org


The new xerces reports a validation error for the "eml" module using ant test. 
This seems to be because keys are defined that are not used.  Nedd to determine
if this is truly invalid or a xerces bug.  If its invalid, we'll need to change
our key system becuase it won't work with optional key fields.