While you could check out the source tree, source code organization is largely a matter of personal preference.

虽然可以签出源代码树，但是源代码的组织主要是个人偏好的问题。

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DOMDocument class: Check out the PHP Manual entry for this class, which represents an entire HTML or XML document and serves as the root of the document tree.

DOMDocument 类：查阅有关这个类的 PHP Manual 项，这个类代表了整个 HTML 或 XML 文档并充当文档树的根。

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Use Subversion (SVN) to check if the local working copy of the source tree is out of date.

用Subversion (svn)检查源树的本地工作拷贝是否过期。

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For a fun activity to do with the whole family, check out our homemade holiday greeting card and DIY Christmas cracker tutorials, and before putting your gifts under the tree, don't miss our guide to eco-friendly gift wrap alternatives.

ENGADGET: Inhabitat's Week in Green: invisibility cloak, a Hobbit House and a portable washing machine