Therefore, WS-BPEL claims that only one request-response operation per process instance may be active at any given time for each port type, operation, correlation set, and partner link.
因此，WS-BPEL 要求，在任何给定时间，对于每个端口类型、操作、相关集和伙伴链接，每个流程实例只能有一个请求-响应操作。
Other, less-widely supported pseudo-classes include: first-child, : link, : visited, : active, and: focus and: lang. Note that a pseudo-class can be applied to a specific element type, like this.
还没有得到广泛支持的其他伪类包括：first - child、：link、：visited、：active、：focus和：lang。
Other, less-widely supported pseudo-classes include: first-child, : link, : visited, : active, and: focus and: lang. Note that a pseudo-class can be applied to a specific element type, like this.
还没有得到广泛支持的其他伪类包括：first - child、：link、：visited、：active、：focus和：lang。
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