1. A template interfacing apparatus for sequentially providing microinstructions to a microprogrammed pipelined data processing system, said template interfacing apparatus comprising: template micromemory means for addressably storing a plurality of templates, each template therein comprising a series of addressable microinstructions, each said series having a starting microinstruction address, each said addressable microinstruction therein further including template family control information; address means for addressing said template micromemory means to sequentially read out therefrom said plurality of templates, said address means loadable to said starting microinstruction address of an individual template in said plurality thereof and incrementable thereafter for sequencing through said series of microinstructions of said individual template; input means for providing said starting microinstruction address of a next individual template to said address means, said input means also providing an next individual template indication for indicating that said starting microinstruction address of said next individual template is ready for loading into said address means, and said input means also for providing front family parameter information concerning said next individual template associated with said starting microinstruction address ready for loading into said address means; control means responsive to the template family control information associated with the microinstruction most recently read from said template micromemory means and to said front family parameter information provided by said input means for providing said next individual template starting address from said input means to said address means when said next template indication is provided by said control means and said template family control information associated with said microinstruction most recently read from said template micromemory means and said front family parameter information provided by said input means indicate that such loading of said next individual template will be interference-free with regard to individual templates being read from said template micromemory means; and means connected between said template micromemory means and said microprogrammed pipelined data processing system for transferring microinstructions read from said template micromemory means to said microprogrammed pipelined data processing system.