There are some changes you can make to an existing set of wsdl and xsd files that are backward compatible so that you can evolve your service , to a limited degree , without the drastic measure of creating a new one 您可以对现有wsdl和xsd文件进行一些改变使它们向后兼容，从而在一定程度上发展您的服务，而无需使用要重新创建web服务的激进方法。
Keyword had to be retained , because c had to be as closely backward compatible with c as possible ; otherwise , not only would it have been less popular with the existing programmer base , but it probably would not have been allowed out the door 关键字，因为c + +必须尽可能与c保持后向兼容；否则，它可能不会在现有程序员人群中如此流行，更可能根本就不会面世。
Although the ado . net components in the . net framework are designed to be both forward and backward compatible excluding new features , you should be aware of several issues that affect the forward or backward compatibility of an application 尽管. net framework中的ado . net组件旨在同时提供向前和向后兼容性（除了新功能） ，但仍然需要注意几个会影响应用程序向前和向后兼容性的问题。
These two versioning problems combine to create dll conflicts , where installing one application can inadvertently break an existing application because a certain software component or dll was installed that was not fully backward compatible with a previous version 这两类版本控制问题结合在一起产生了dll冲突，在这些冲突中，安装一个应用程序可能会无意间破坏现有的应用程序，因为所安装的某个软件组件或dll与以前的版本不完全向后兼容。
This updated runtime is a replacement for the vsto 2005 runtime and is fully backward compatible with solutions authored using vsto 2005 . it contains enhancements that help solutions built on microsoft office 2003 with vsto 2005 run more reliably in the 2007 microsoft office system than they would with the original vsto 2005 runtime 这个更新的执行阶段是用来取代vsto 2005 runtime ，与使用vsto 2005设计的方案具有完全回溯相容性，功能更为强大，使得在microsoft office 2003上以vsto 2005建置的方案，在2007 microsoft office system上执行时，比在原始的vsto 2005 runtime上执行更可靠。
