9. Method according to claim 7 , wherein the semantic compatibility relations between principal nodes of the object type and/or principal nodes of the activity type of at least one semantic tree are determined.
9. Method according to claim 7 , wherein the semantic compatibility relations between principal nodes of the object type and/or principal nodes of the activity type of at least one semantic tree are determined. 10. The method according to claim 9 , further comprising determining whether the document analysed has a meaning by determining the relations between principal nodes of at least one semantic tree, selected from a group comprising a spatial, temporal, causal, anaphoric and cataphoric relations.