这一服务规范稍微有些复杂，这是因为它是通过使用简单的回调式的交互对交付者和订购者之间的交互进行建模。
This service specification is a little more complicated, because it models the interaction between a shipper and an orderer by using a simple callback style interaction.
ShippingService服务规范所拥有的ShippingService交互作用，定义了交付者和订购者如何进行相互作用的规则。
The ShippingService interaction owned by the ShippingService service specification defines the rules for how the shipper and orderer interact.
推动提供者对更改的交付。
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