...simulation or other numerical process. The observation pattern and feature is primarily useful for capturing metadataassociated with the estimation of feature properties, which is important particularly when error in this estimate is of interest...
http://xml.coverpages.org/ni2008-01-31-a.html
...SOAP-based protocol for accessing XML representations of Web service-based resources. The fifth defines how metadataassociated with a Web service endpoint can be represented as resources, how metadata can be embedded in endpoint references...
http://www.w3.org/