func AddLoader(predicate DocMatcher, load DocLoader) {
	prev := loaders
	loaders = &loader{
		Match: predicate,
		Fn:    load,
		Next:  prev,
	}
	spec.PathLoader = loaders.Fn
}
func AddLoader(predicate DocMatcher, load DocLoader) {
	prev := loaders
	loaders = &loader{
		Match: predicate,
		Fn:    load,
		Next:  prev,
	}
	spec.PathLoader = loaders.Fn
}
func AddLoader ( predicate DocMatcher , load DocLoader ) { prev := loaders loaders = & loader { Match : predicate , Fn : load , Next : prev , } spec . PathLoader = loaders . Fn }
// AddLoader for a document
AddLoader for a document