This document describes a set of Extension Headers for the Unidirectional Lightweight Encapsulation (ULE), RFC 4326. The Extension Header formats specified in this document define extensions appropriate to both ULE and the Generic Stream Encapsulation (GSE) for the second-generation framing structure defined by the Digital Video Broadcasting (DVB) family of specifications.

Semistructured data has no absolute schema xed in advance and its structure may be irregular or incomplete. Such data commonly arises in sources that do not impose a rigid structure (such as the World-Wide Web) and when data is combined from several heterogeneous sources. Data models and query languages designed for well structured data are inappropriate in such environments. Starting with a \l...

With the continuous improvement of imaging quality requirement space optical system, large-aperture mirror becomes research focus. However, increase aperture will whole weight which results in high launch cost and degrades surface figure accuracy. Therefore, lightweight design method structure is great importance. In recent years, many telescope system schemes have demonstrated progress structu...