document: Improving portlet interoperability through deep annotation Portlets ( i.e. multi-step , user-facing applications to be syndicated within a portal ) are currently supported by most portal frameworks . However , there is not yet a definitive answer to portlet interoperation whereby data flows smoothly from one portlet to a neighbouring one . Both data-based and API-based approaches exhibit some drawbacks in either the limitation of the sharing scope or the standardization effort required . We argue that these limitations can be overcome by using deep annotation techniques . By providing additional markup about the background services , deep annotation strives to interact with these underlying services rather than with the HTML surface that conveys the markup . In this way , the portlet producer can extend a portlet markup , a fragment , with data about the processes whose rendering this fragment supports . Then , the portlet consumer ( e.g. a portal ) can use deep annotation to map an output process in fragment A to an input process in fragment B. This mapping results in fragment B having its input form ( or other `` input '' widget ) filled up . We consider deep annotation as particularly valid for portlet interoperation due to the controlled and cooperative environment that characterizes the portal setting .
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