It does this by providing domain relevant reference models, as well as stereotyped elements and properties, that capture SIP-specific information (such as SIPfilter patterns) in the servlet models.
The timer/filter hold back the leaves and your cuppa is ready to sip!
定时器/过滤器可以阻止茶叶下落，你的茶就快可以细细啜饮了。
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In the case of a SIP Servlet, this information includes the pattern or filter criteria that defines the conditions under which this SIP Servlet should be activated by the container.