called on exit, assuming we get far enough to have the log initialized

AdditiveExpr ::= MultiplicativeExpr | AdditiveExpr '+' MultiplicativeExpr | AdditiveExpr '-' MultiplicativeExpr

AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr

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EqualityExpr ::= RelationalExpr | EqualityExpr '=' RelationalExpr | EqualityExpr '!=' RelationalExpr

Expr ::= OrExpr

FilterExpr ::= PrimaryExpr | FilterExpr Predicate Predicate ::= '[' PredicateExpr ']' PredicateExpr ::= Expr

LocationPath ::= RelativeLocationPath | AbsoluteLocationPath AbsoluteLocationPath ::= '/' RelativeLocationPath? | '//' RelativeLocationPath

MultiplicativeExpr ::= UnaryExpr | MultiplicativeExpr '*' UnaryExpr | MultiplicativeExpr 'div' UnaryExpr | MultiplicativeExpr 'mod' UnaryExpr

OrExpr ::= AndExpr | OrExpr 'or' AndExpr

PathExpr ::= LocationPath | FilterExpr | FilterExpr '/' RelativeLocationPath | FilterExpr '//' RelativeLocationPath

PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall

RelationalExpr ::= AdditiveExpr | RelationalExpr '<' AdditiveExpr | RelationalExpr '>' AdditiveExpr | RelationalExpr '<=' AdditiveExpr | RelationalExp

RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | RelativeLocationPath '//' Step

Step ::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep AxisSpecifier ::= AxisName '::' | '@'? NodeTest ::= NameTest | NodeType '(' ')' | 'proces

UnaryExpr ::= UnionExpr | '-' UnaryExpr

UnionExpr ::= PathExpr | UnionExpr '|' PathExpr

takes a string of hex and resolves it to an integer

takes a string containing a mathematical expression (possibly including variables) and resolves it to a float value