| NodeHeaderTKey | Contains basic data about a node in the SortedTree. |
| NodeWriterTKey, TValue | Provides methods for writing sequential-order nodes in a tree structure. |
| SequentialSortedTreeWriterTKey, TValue | A specialized serialization method for writing data to a disk in the SortedTreeStore method. |
| SparseIndexWriterTKey | Contains information on how to parse the index nodes of the SortedTree. |