1·This is the tag (using the normal URI encoding conventions where a space is represented by the plus sign).
这就是标记（使用标准的 URI 编码惯例，其中空格由加号表示）。
2·To show what classifiers belong to the package, a line is drawn from each classifier to a circle that has a plus sign inside the circle attached to the package (Figure 9).
为了显示属于软件包的分类器属于，从每个分类器画一条线到里面有加号的圆周，这些圆周粘附在软件包之上(图9)。
3·Clicking the plus sign instead of double clicking the model allows you to browse the model without opening the diagram, and thus potentially triggering other models to load.
点击这个加号而非双击模型，这样允许您在不打开这个图的情况下浏览这个模型，这样还会潜在触发其它模型来加载。
4·You can easily expand element imports and package imports by clicking the plus sign, as shown in Figure 26.
您可以通过点击这个加号从而轻松地展开元素和包的导入，如图26所示。
5·If you click the plus sign next to a closed model, the model will open without opening the main diagram or the model editor.
如果您点击一个封闭模型旁边的加号，在不打开主图或者这个模型编辑器的情况下就可以打开这个模型。