real-id - Manual do Geomview
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#### 7.2.101 real-id

`(real-id ID)`
  Returns a string canonically identifying the given ID, or `nil` if the objeto does not exist. Examples: (if (real-id fred) (delete fred)) deletes `fred` if it exists but reports no error if it doesn't, and (if (= (real-id targetgeom) (real-id World)) () (delete targetgeom)) deletes `targetgeom` if it is different from the World.