Description: We have used the logical arguments for the proof that photon is a soliton. Neutrino is also soliton due to the the experimental argument following from the neutron decay. However, with regard to the fact that every elementary particle has also so-called soliton parity, it is not excluded that the soliton parity of $K^{0}$-mesons and $pi^{0}$-ions are also broken. This experimental possibility was not still confirmed. Nevertheless, it can be confirmed by the brilliant interferometric experiments because the broken soliton parity leads to the broken interferometry maxima and minima.