Through the domain analysis of GIS application system, this paper designed a simple specification language for GIS application system, named GASL.

通过对GIS应用系统的分析，设计出一种简易的GIS软件规格描述语言GASL。

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According to the ETF Finder at ETF Channel, SD makes up 1.81% of the Daily Natural Gas Related Bull 3x Shares ETF ( AMEX: GASL )which is trading higher by about 0.8% on the day Friday.

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