When first setting up a modeling project, a common request is to populate the catalog with information that may already exist in your organization, rather than having to input it all manually.
第一次设置建模项目时，一个常见要求是使用可能已存在于组织中的信息填充目录，而不是必须手动输入所有信息。
The Semantic web and linked data connect because when we've got this web of linked data, there are already lots of technologies which exist to do fancy things with it.
语义网和关联数据是联系在一起的，因为在我们得到关联数据网的时候，已经有很多技术可以利用关联数据了。
When you call a method on the XML variable, that method doesn't already exist, so it falls into method_missing, which constructs the corresponding XML.
当您在xml变量上调用方法时，该方法尚不存在，因此它属于method_missing，其构建了相应的xml。
When requested, the session can be told whether or not to initiate one if it doesn't already exist.
在请求时，如果会话不存在可以告诉会话是否创建一个。
When you first start Eclipse, you are prompted for the location of this directory (assuming you don't specify it as a command-line option), and Eclipse creates it for you if it doesn't already exist.
当您第一次启动Eclipse的时候，您会获得提示，告知该目录的位置(假定您没有将它指定为命令行选项)，如果不存在该目录，Eclipse会为您创建它。
When you first start Eclipse, you are prompted for the location of this directory (assuming you don't specify it as a command-line option), and Eclipse creates it for you if it doesn't already exist.
当您第一次启动Eclipse的时候，您会获得提示，告知该目录的位置(假定您没有将它指定为命令行选项)，如果不存在该目录，Eclipse会为您创建它。
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