GeometryValidator "OGC Simple Compliant" meaning?

we could definitely add some clarity to the FME user documentation on the GeometryValidator - which simply refers to the OGC simple feature specification: http://www.opengeospatial.org/standards/sfa

FME uses geos (based on the Java Topology Suite) and this has the operators: isSimple: http://www.tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/operation/IsSimpleOp.html isValid: http://www.tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/operation/valid/IsValidOp.html

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isSimple Checks for OGC simple (taken from geosdll_api_geom.h::isSimpleWithInfo):

 

if multipoint, check for repeated points

 

if anything else, check for self-intersection

 

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isValid Checks for OGC valid (taken from isValidOp.cpp::checkValid):

 

if point, check for Invalid Coords

 

if lineString, check for Invalid Coords, too-few-points,

 

if linearRing, check for Invalid Coords, closed rings, too-few-points, self-intersecting rings

 

if polygon, check for Invalid Coords, closed rings, too-few-points, consistent areas (intersecting or duplicate rings), self-intersecting rings, holes in shell, nested holes, connected interior

 

if multiPolygon, similar to polygons, but also checks if polygons intersect each other

 

if GeometryCollection, break apart, the check based on geometry type