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Other Considerations
Component Categories for Describing Internet-Aware Objects
In all the various features defined in this document, there are various useful categories for describing what a object requires from its container as well as what features an object supports, which is useful in a container's browsing UI. The following tables describe the meaning for various categories as both "implemented" and "required" categories:
"Required" Categories Description CATID_PersistsToMoniker, CATID_PersistsToStreamInit, CATID_PersistsToStream, CATID_PersistsToStorage, CATID_PersistsToMemory, CATID_PersistsToFile, CATID_PersistsToPropertyBag Each of these categories are mutually exclusive and are only used when an object supports only one persistence mechanism at all (hence, the mutual exclusion). Containers that do not support the persistence mechanism described by one of these categories should prevent themselves from creating an object of classes so marked. CATID_RequiresDataPathHost The object requires the ability to save data to one or more paths and requires container involvement, therefore requiring container support for IbindHost.
"Implemented" Categories Description CATID_PersistsToMoniker, CATID_PersistsToStreamInit, CATID_PersistsToStream, CATID_PersistsToStorage, CATID_PersistsToMemory, CATID_PersistsToFile, CATID_PersistsToPropertyBag Object supports the corresponding IPersist*mmechanism for the category. CATID_InternetAware The object is "Internet-aware" meaning that the object needs no special behavior to work well in the Internet environment, or the object uses large data sets but is written to retrieve that data asynchronously. In addition, all "Internet-aware" objects are marked with OLEMISC_SETCLIENTSITEFIRST. This category is defined to aid authoring tools differentiate between objects that may or may not understand the special implications of the Internet. The following table provides the exact CATIDs assigned to each category:
Category CATID CATID_RequiresDataPathHost 0de86a50-2baa-11cf-a229-00aa003d7352 CATID_PersistsToMoniker 0de86a51-2baa-11cf-a229-00aa003d7352 CATID_PersistsToStorage 0de86a52-2baa-11cf-a229-00aa003d7352 CATID_PersistsToStreamInit 0de86a53-2baa-11cf-a229-00aa003d7352 CATID_PersistsToStream 0de86a54-2baa-11cf-a229-00aa003d7352 CATID_PersistsToMemory 0de86a55-2baa-11cf-a229-00aa003d7352 CATID_PersistsToFile 0de86a56-2baa-11cf-a229-00aa003d7352 CATID_PersistsToPropertyBag 0de86a57-2baa-11cf-a229-00aa003d7352 CATID_InternetAware 0de86a58-2baa-11cf-a229-00aa003d7352 For more information on categories, see the Component Categories document.
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