+ return lookup[stanza];
+end
+local stanza_mt = st.stanza_mt;
+local function create_cloner(stanza, chunkname)
+ local lookup = {};
+ local name = create_clone_string(stanza, lookup, "");
+ local f = "local setmetatable,stanza_mt=...;return function(data)";
+ for i=1,#lookup do
+ f = f.."local _"..i.."="..lookup[i]..";";
+ end
+ f = f.."return "..name..";end";
+ local f,err = loadstring(f, chunkname);
+ if not f then error(err); end
+ return f(setmetatable, stanza_mt);
+end
+
+local template_mt = { __tostring = function(t) return t.name end };
+local function create_template(templates, text)
+ local stanza, err = parse_xml(text);
+ if not stanza then error(err); end
+
+ local info = debug.getinfo(3, "Sl");
+ info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)";
+
+ local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt);
+ templates[text] = template;