SECTION -VENDORS DATA 2 Proposals

Unlike the relational model, object-oriented data models cannot all be traced back to a single major proposal. The closest thing to this notion is a manifesto (found, e.g., in Atkinson et al. (1990)) signed by prominent members of the research community whose recommendations are covered by and large in the treatment given in this section. The ODMG industry consortium of object database vendors has proposed an object-oriented data model that is widely seen as the de facto standard (Cattell et al., 2000). 

This procedure, although it does not yield the overall dimensions of the treater (including the inlet gas separation and FWKO sections), does provide a methodology for specifying the heating requirements and a minimum size for the coalescing section (where the treatment actually occurs). It is also invaluable when evaluating vendor proposals and when limited laboratory data are available. 

There have been numerous attempts to develop standard connection table formats for data exchange, almost all of which have sunk rapidly and without trace. An XML-based connection table format, Chemical Markup Language (CML) was proposed in the late 1990s and has now reached version 2.4 which incorporates a number of extensions for representation of features such as spectra, reactions and polymers. Though there is now an extensive CML literature, its adoption by commercial software vendors has thus far been very limited. Greater penetration has been achieved by the lUPAC Chemical Identifier, which is essentially a highly-compacted connection table, discussed in the next section. 

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