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 is used for gml elements that appear in this schema. therefore, to avoid duplicate element errors, we can not import the sopac-modified gml 3.1.1 schemas via the includes.xsd in the 3.1.1. dir. 2) this schema WILL NOT VALIDATE. 3) check out to http://sopac.ucsd.edu/ns/geodesy/reason/grws/pc/1.0.0