说明：  This document describes the structure of the FEBio binary database (that is, the FEBio plot file format), which stores the results of an FEBio analysis. The FEBio binary database format is both self-describing and extendible. A user can understand the contents of the file by simply parsing the block structure of the file. The file format is made extendible by providing an abstract layer between the data and the file system. This layer defines the file structure as a hierarchy of data blocks, where each block is identified by a unique number. The result is that each file is now structured similarly as a file folder. Each block can be viewed as a file in the folder and each branch in the hierarchy as a sub-folder.