ORA-13026: unknown element type for element

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ORA-13026: unknownelement type for element string.string.string
Cause: TheSDO_ETYPE column in the <layer>_SDOGEOM table contains an
invalid geometric element type value.
Action: Redefinethe geometric element type in the <layer>_SDOGEOM table for
the specified geometric element using one of the supported SDO_ETYPE values.
13-18 Oracle Database ErrorMessages
See the Oracle Spatial documentation for anexplanation of SDO_ETYPE and its
possible values.