This strategy works fine as long as RDF processing tools are available to everyone, or as long as you're willing to provide a free Web service to validate DOAP.

只要每个人都可以使用RDF处理工具，或者只要您愿意提供免费的Web服务来验证DOAP，这种策略就可以用得很好。

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All these tools are available for free download (see Resources).

所有这些工具都可以免费下载(请参阅参考资料)。

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There are a number of free tools available on the Internet that help build search friendly sites.

Internet上有许多可用的免费工具，用于帮助用户构建“搜索友好”站点。

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Fortunately, there are a lot of good, and mostly free, tools available on the Internet to help you set your savings objectives and goals.

FORBES: Retirement