NewFragment creates a new list of Fragment.

NewWBBTreeNode creates a new list of WBBTreeNode.

Fragment_TypeID is the unique identifier for the type Fragment.

WBBTreeNode_TypeID is the unique identifier for the type WBBTreeNode.

Fragment_List is a list of Fragment.

Fragment_Promise is a wrapper for a Fragment promised by a client call.

Fragment_specific_Promise is a wrapper for a Fragment_specific promised by a client call.

WBBTreeNode_List is a list of WBBTreeNode.

WBBTreeNode_Promise is a wrapper for a WBBTreeNode promised by a client call.