For the last time...
Post-modernism is NOT a set of philosophical dictates, it is a description of a (rather vague) set of critical theories referring to literature, drama, architecture, design, music and so on - from a particular point in time; their emergence having started in the late 20th century.
Friel - please read and understand the link above. Oh, and whilst you are at it - learn the meaning of 'begs the question'. I know you pride yourself on your intellectual acumen - but you shouldn't... Not because pride is a sin, but because your density approaches that of material found in strange quark stars.