Consider the problem on how to describe UML model using XML from the Angle of model transformation and regarding the result of XML description as XML model.

为了把UML模型用XML描述出来，可以从模型转换的角度来考虑这个问题，把XML描述结果当作XML模型考虑。

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The terraces spiral upwards, catching the light at every angle, adding to the allure of this tiered tower, whilst leaving an impression of progressive transformation.

建筑形式像梯田一样螺旋向上，在建筑每个角度上都可以采光，增加了这个塔式建筑的魅力，同时给人留下一种渐变的印象。

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WENXIAN TONGKAO summarized the transformation of institutions by wide historical angle of view, afforded reference for the real society.

《文献通考》从更为开阔的历史视角总结典制因革，为经世之用提供制度模式的参照；

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