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Changed: 2,3c2,5
< * To build any serious VO application working with the data (like cone search, skynode, just simple crossmatch) the system storing the catalogues and their metadata <b>must</b> be built.
< * Up To the moment there is no such catalog storing systems. But there are good examples like CASjobs and Openskyquery, but they are not public and with some disandavantages.
to
> * Any serious VO application requires access to data and ability to do basic operations with them like cone search, crossmatch queries. So, we need to develop a system, which hosts
> catalogues and their metadata.
> * Up To the moment there is no such catalog storing system.
> However, there are good examples like CASjobs and Openskyquery, but they are not public and have several disadvantages.
The motivation to build CAS (catalog access service)
So the main idea is:
Finally, we should say that creating of CAS is mainly preparation of the VO work, preparation to enable even such simple things like cone search based on Q3C.