在最基本的层次上，它是一种用于描述矢量图的xml语言。矢量图是由绘图线条构成的图形，与位图图形相对，后者是由绘图像素构成的图形。
At the most basic level, it is an XML language for describing vector graphics — pictures made by drawing lines (as opposed to bitmap graphics — pictures made by drawing pixels).
同时只能由一个人进行绘图工作，因为这是在编辑简单的文档。
Only one person at a time can work on a drawing, because it is editing a simple document.
这个项目是由英国遗址组织与格林和治集团，阿特金斯绘图和考古与环境组织的协作下进行的。
The project is being undertaken by English Heritage with the assistance of Greenhatch Group together with Atkins Mapping and Archaeo-Environment.
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