The key point here is that you are indeed looking for unique, non-context-related identifiers for each type.
关键在于，实际上我们正在寻找的是适用于每种类型的、惟一的、与上下文无关的标识符。
2
Canonical expression keeps the external expression of service contracts consistent, thereby affecting contract and context-related patterns.
规范表述保证了服务契约外部描述的一致性，因此影响了契约和上下文相关的模式。
3
As he visits the various portal pages which provide him with necessary information, context-related data items are stored within the context-exchange portlet.