Paul Jamason, SOPAC 02/13/2006. This is a SOPAC-specific version of the observationCollection schema developed by Galip Aydin and used for position observations. Notes: 1) gmlOcTypes.xsd created by trang schema generator contains elements that appear in this schema. therefore, to avoid duplicate element errors, we would have to not import the sopac-modified gml 3.1.1 schemas via the includes.xsd in the 3.1.1. dir. 2) as a result, this schema WILL NOT VALIDATE. it will compile in xmlbeans howver. 3) check out to http://sopac.ucsd.edu/ns/geodesy/reason/grws/pc/(version number) MODS: 08/22/2006: added neu/xyz vels/velSigs (v1.1.0)