IMetadataSchemaCallback::AddItemMetadataSchema
Adds an ITEM_METADATA_SCHEMA object that represents the metadata schema for an item. This includes how to identify an item and its version information, and how change units are defined.
S_OK
SYNC_E_PFX_METADATA_STORE_VERSION2_REQUIRED when the provider requires a metadata store component of version 2 or later
SYNC_E_PFX_INVALID_OPERATION when the simple provider already has a schema defined or the simple provider requires that this method be called only in ISimpleSyncProvider::GetMetadataSchema
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