The official specifications for XQuery can be downloaded from the W3C site; this page also hosts a list of XQuery implementations.

XQuery的官方规范可以从W3C site下载；这个页面中还包含XQuery实现的列表。

youdao

Relaxed.vse.cz: Relaxed does not use the official W3C specifications for validation, but instead uses some of its own to check out your document.

cz：Relaxed没有使用官方的W3C规范进行验证，而是使用自己的一些规则来验证你的文档。

youdao

Despite rumours that Sony will make announcements about the PS4 in mid-2013, the firm has not given any official details of the specifications of the hardware nor when it might be released.

BBC: Sony stops production of PlayStation 2

As part of the announcement, Google also gave the first official details of the device's specifications.

BBC: Google Glass: No advertising allowed, developers told