def link(self, other):
        """
        Link (associate) this object with anI{other} properties object
        to create a network of properties.  Links are bidirectional.
        @param other: The object to link.
        @type other: L{Properties}
        @return: self
        @rtype: L{Properties}
        """
        p = other.__pts__
        return self.properties.link(p)