javascript - What does "<" isolate binding mean -

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i've come across following "<" isolate binding in source code:

switch (mode) {  case '@': ... case '=': ... case '&': ...  case '<':     if (!hasownproperty.call(attrs, attrname)) {       if (optional) break;       attrs[attrname] = void 0;     }     if (optional && !attrs[attrname]) break;      parentget = $parse(attrs[attrname]);      destination[scopename] = parentget(scope);     initialchanges[scopename] = new simplechange(_uninitialized_value, destination[scopename]);      removewatch = scope.$watch(parentget, function parentvaluewatchaction(newvalue, oldvalue) {       if (newvalue === oldvalue) {         // if new , old values identical first time watch has been triggered         // instead use current value on destination old value         oldvalue = destination[scopename];       }       recordchanges(scopename, newvalue, oldvalue);       destination[scopename] = newvalue;     }, parentget.literal);      removewatchcollection.push(removewatch);     break;

angular docs mention first three, purpose of 1 "<"?


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