GeoSPARQL 3D White Paper sections/01-front_material.adoc sections/03-introduction.adoc sections/03a-motivation.adoc sections/03b-related-work.adoc sections/04-curcapabilities.adoc sections/05-geosparql3D.adoc sections/06-benefits.adoc sections/97-annex-n.adoc sections/98-annex-history.adoc sections/99-annex-bibliography.adoc