ORA-54529: geometry should have multi-level hierarchy (like triangle)

曾春华

ORA-54529: geometry should have multi-levelhierarchy (like triangle)

Cause: The geometry did not have themulti-level hierarchy required for this

operation. For example, if the parameter to elementextractor (hierarchy level) is

not LOWER_LEVEL, but the geometry etype is ETYPE_SOLIDand gtype is

GTYPE_SOLID, an extract operation is not allowed, becausea simple solid can

only be decomposed into lower level geometries, such ascomposite surfaces.

Action: Ensure that the geometry hasthe appropriate hierarchy. For example, if

the geometry etype is ETYPE_SOLID and gtype isGTYPE_SOLID, the parameter

to element extractor (hierarchy level) should beLOWER_LEVEL.