| 摘要 |
A database system comprising a node value stored in a first electronic data memory device sector. A lock state and access visa associated with the node value, such that if the visa is non-zero, the visa must be presented to access the node. A notification field associated with the node value, the notification field stored in a second electronic data memory device sector. An update processor configured to electronically retrieve and process the notification field if the node value is modified.
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