XML Vocabulary - Environmental Sampling Data

I have a very specialized XML need for personal research that I am
doing.  I am looking for an existing XML vocabulary (open standard) that
focuses on the collection of sampling data from environmental sensors -
for example, from sensors on telephone poles which perform pollution
measurements.  This vocabulary would therefore represent the detailed
measurement data.

Does anyone know of such a vocabulary, or something similar?

Thanks in advance,
Joe Chiusano
Booz | Allen | Hamilton