// include only some attributes from passed in bundles. See the
// empty constructor in j/c/g/gxp/base/GxpAttrBundleBuilder.java
Set<String> includeAttrs = (attrBundles.size() == 1)
? Collections.<String>emptySet() : bt.getAttrMap().keySet();
AttrBundleParam newBundle =
new AttrBundleParam(call, callee.getSchema(), includeAttrs,
attrBundle.getValue(), call.getAttrBundles());
newAttrBuilder.put(attrBundle.getKey(),
new Attribute(call, attrBundle.getKey(),
newBundle, null));