public void setRelativePath(QPath relPath) {
        if (relPath != null && relPath.isAbsolute()) {
            throw new IllegalArgumentException("relPath must be relative");
        }
        this.relPath = relPath;
    }
public void setRelativePath ( QPath relPath ) { if ( relPath != null && relPath . isAbsolute ( ) ) { throw new IllegalArgumentException ( "relPath must be relative" ) ; } this . relPath = relPath ; }
Sets the relative path to the property in this relation.

@param relPath the relative path to a property.
@throws IllegalArgumentException if <code>relPath</code> is absolute.