Physical Layer Service Access Point 物理层服务访问点
As the bottom layer of the ODFDOM hierarchical structure, it provides direct access to the physical storage in the ODF package, such as XML streams, pictures, and embedded objects.
它是ODFDOM层次化结构中最低的一层，它提供对odfdom包中的物理存储的直接访问，比如xml流、图像和嵌入的对象。
The services layer provides a service as a single point of access and can help the gradual physical consolidation of the implementers of that service over time.
服务层以单一访问点的形式提供服务，并且可以帮助逐步对服务的实现者进行物理合并。
The link layer refers to the device drivers providing access to the physical layer, which could be numerous mediums, such as serial links or Ethernet devices.
链路层是指提供对物理层访问的设备驱动程序，这可以是各种介质，例如串口链路或以太网设备。
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