Exclusion of evidence against application of document to existing facts
96.  When language used in a document is plain in itself and when it applies accurately to existing facts, evidence may not be given to show that it was not meant to apply to such facts.
Illustration
     A conveys to B by deed “my estate at Kranji containing 100 hectares”. A has an estate at Kranji containing 100 hectares. Evidence may not be given of the fact that the estate meant was one situated at a different place and of a different size.