There are three main ways to implement a file format library in software.
有三种主要的方式可在软件内实现一个文件格式库。
You use the library by opening the document and reading the file, followed by looping through each block in the main control block, as shown in Listing 1.
若要使用这个库，可以打开此文档并读取文件，然后依次循环主控制块内的每个块，如清单1所示。
The download contains a src/facebook.php file (this is the main library) and an examples/example.php file.
下载包含一个 a src/facebook.php 文件（这是主库）和一个 examples/example.php 文件。
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