Consider renaming the element geoLocations - at present, it is unclear if this refers to the location where a resources was collected/curated.
geoLocation - geometry, toponym - you may simply this by eliminating the element 'geoLocation' and set the XML 'choice' element max occurrence as 'unbounded'. A user may specify spatial and non-spatial location at the same time.
geometry type - consider using wkt format
sridType
-- expand the values or consider using a list of EPSG codes (http://www.epsg-registry.org/), e.g., "EPSG:XXX", where "XXX" is the EPSG code for the referenced coordinate system; "none" shall be provided if the coordinate system is unreferenced.
-- this element shoud be set as 'required'.