"There are many ways to filter news feeds from your favorite sources... For the purpose of this post, however, we'll focus on services that let you filter by keyword.
<dispatcher>FORWARD</dispatcher>
<dispatcher>REQUEST</dispatcher>
INCLUDE: Use this for the filter to be applied to any include targets matching a specified servlet name or with URLs matching a specified pattern.
FORWARD: Use this for the filter to be applied to any forward targets matching a specified servlet name or with URLs matching a specified pattern.
REQUEST: Use this in addition to an INCLUDE or FORWARD setting (one <dispatcher> element for each setting) for the filter to also be applied to direct request targets matching a specified servlet name or with URLs matching a specified pattern. (It is nonsensical to use the REQUEST value only. If you want the filter to apply only to direct requests, there is no need to use the <dispatcher> element.)
ERROR: Use this for the filter to be applied under the error page mechanism.
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S. Schneegans, P. Vorst, и A. Zell. Proceedings of the 3rd European Conference on Mobile Robots (ECMR 2007), стр. 241-246. Freiburg, Germany, (сентября 2007)