Integrable chains with Jordan - Schwinger representations

The restiction to the class of Jordan - Schwinger representations of s`(n+1) results in simple relations for the L matrices and in explicit expressions for the general Yang-Baxter operators as products of two parameter permutation operators. Limits are studied which are related to the finite dimensional representations and to degenerate Yangians. The analogy to the s`(2) case leads to analogous forms of global spin chain operators