Core Function Implementation for PostgreSQL

PerlMol is a module add-on to the perl language that facilitates working with molecular structures using SMILES, SMARTS, and molfiles, as well as other functionality. PerlMol is available from CPAN, the Comprehensive Perl Archive Network. In order to install PerlMol, it is recommended to use the command cpan -i PerlMol as superuser in order to install the modules into the system perl library. This will install all the necessary modules for the following functions, as well as other parts of PerlMol that may be useful. 

The following code will define the core functions described in Chapter 7 of this book. The isosmiles function is not included here because of limitation of PerlMol. These functions apply only to the PostgreSQL RDBMS. 

Create Or Replace Function valid(text) Returns Boolean As EOPERL use Chemistry File auto  

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