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OASIS is the purported commercial successor to the integrated circuit design and manufacturing electronic pattern layout language, [[GDSII]].
GDSII was created in the 1970s when integrated circuit designs had a few hundred thousand geometric shapes, properties and placements to manage. Today, there can be billions of shapes, properties and placements to manage. OASIS creators and users claimed that the growth of workstations' data storage and handling capabilities was far outpaced by the growth of Integrated Circuit layout complexity.<ref>http://www.eetimes.com/document.asp?doc_id=1276148</ref> Therefore, OASIS tries to solve the purported problem of the large size of the [[GDSII]] files by introducing complicated types of the geometric shapes (25 types of trapezoids only) to reduce the data size. Also, variable-length numeric format (similar to [[Run-length encoding]]) for coordinates was implemented. Finally, each cell in the OASIS file can be independently compressed by the [[gzip]]-like algorithm.
The effort to create the OASIS format started in June 2001. The release of version 1.0 took place in March 2004. Its use required the development of new OASIS readers and writers that could be coupled to design and manufacturing equipment already equipped with GDSII readers and writers. Its adoption was born of a concerted effort by integrated circuit design, equipment, photomask, fabless, 3rd party Intellectual Property (IP) and manufacturing companies from the United States, Japan, Taiwan, Korea and Europe.
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