仔细阅读参考手册，访问确实用x Forms开发工具使用和定制表单的其他企业的网站，也有助于甄别供应商。
Careful reference checking and a site visit to other organizations that are actually using and customizing the forms with XForms development tools is an obvious way to vet the vendors.
第一个附录是一些开源资源，包括对开源代码开发者有所帮助的网站和工具，以及其它文章和书的参考文献。
The first is a list of open source resources, including useful Websites, tools to help open source developers, and references to other articles and books.
所需的第一个工具就是WURFL，可以从它的官方网站下载(请参阅参考资料)。
The first thing you need is WURFL, which you can download from its official Web site (see Resources).
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