code: func (b *Builder) Stdin() *Builder {
  	b.stream = true
  	b.paths = append(b.paths, FileVisitorForSTDIN(b.mapper, b.schema))
  	return b
  }
docs: // Stdin will read objects from the standard input. If ContinueOnError() is set
  // prior to this method being called, objects in the stream that are unrecognized
  // will be ignored (but logged at V(2)).