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class OEExprBase
OEExprBase is an abstract class which defines an interface through which boolean expressions can test equivalence of nodes (atoms) and edges (bonds) during graph match processes. The expression class interface simplifies what is normally a binary tree representation of attributes which atoms and bonds must (not) have in order to be called equivalent to a corresponding node or edge. Derived classes may be used to extend the graph matching algorithms in OEChem to compare attributes beyond the pre-defined expressions in OEChem. In addition, user-defined expression classes may take full advantage of the arbitrary data storage mechanism which is part of the OEBase class. Expression equivalence could then be performed on dynamic user-defined data extensions to atoms and bonds.
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