Adobe Labs对Hydra语言的描述是一门“高性能图像处理语言”。

Adobe labs describes Hydra as a, “high-performance image processing language.”

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XSL - FO 1.1[开发中]是这种语言的升级，增加了注释、索引、书签之类的特性，并增强了图像的处理能力。

XSL-FO 1.1 [in development] is an update to the language that adds features such as change annotations, indexes, bookmarks, and enhancements to handling of graphics.

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顾名思义，DPS利用PostScript (PS)图像处理模型和语言来生成屏幕上的图形，不过因应用户交互的需要做了一定的改动。

As the name implies, DPS USES the PostScript (PS) imaging model and language to generate on-screen graphics with some modifications to support user interactions.

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