关键词：数据库；标记语言；元数据；地形模型；计算机仿真
摘 要：The mission of NPSI is to provide maximum database reuse across Type/Model/Series platforms to lower the life cycle cost of out-the-window visual terrain, 3-D models, and sensor databases, also adding dataset archive capability, and short-notice distribution services. The metadata and metadata architectures are used to facilitate data discovery, data understanding, and effective data distribution. The metadata is also employed for NPSI dataset archiving and distribution. This document describes the metadata schema specified for NPSI data interchange.