how many ideologies do the political party of ya'akov katz hold ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_Ya'akov_Katz_ attr_open politician_born_1951 attr_close dbp_party var_x sep_dot var_x dbo_ideology var_uri sep_dot var_x a dbo_PoliticalParty brack_close