Adobe® Extension Builder 3.0 release notes document ( http://download.macromedia.com/pub/labs/extensionbuilder3/extensionbuilder_releasenotes_06 2413.pdf ) says that “Extension Manager does not support bundling of hybrid extensions” (issue #3549187). Hmm…. Really? Building the hybrid extensions is no longer supported???
Extension Manager does support hybrid extensions. But we define hybrid extension as : one extension which contains mxi file, zero, one or more ordinary file(s), and one or more embedded CSXS extensions. That is, only CSXS extensions can be embedded into hybrid extension. If you embed another ordinary extension or hybrid extension into a hybrid extension, it is invalid extension from the perspective of Extension Manager.
thanks for the response. it is clear now.