Embedding additional information in the UIMA descriptors

[Richard Eckart de Castilho]

Hi,

is there some mechanism that allows me to add non-standard information to UIMA 
descriptors, e.g. in a custom XML namespace?
I have tried it in a type descriptor, but then I get a message like:

  The XML parser encountered an unknown element type "ref:externalReferences". 

Cheers,

-- Richard