StreamPipeline pipeline = sitemap.getStreamPipeline();
EventPipeline eventPipeline = pipeline.getEventPipeline();
// Obtain the 'src' attribute
Value ssrc = assq(sargs, Symbol.get("src"));
if (ssrc.eq(FALSE))
throw new RuntimeException("No 'src' attribute specified for 'read'!");
String src = string(pair(ssrc).cdr);
// Obtain the 'mime-type' attribute
Value smimeType = assq(sargs, Symbol.get("mime-type"));