XPath

LocationPath RelativeLocationPath | AbsoluteLocationPath AbsoluteLocationPath '/' RelativeLocationPath? | AbbreviateAbsoluteLocationPath RelativeLocationPath Step | RelativeLocationPath '/' Step | AbbreviatedRelativeLocationPath Step AxisSpecifier NodeTest Predicate | AbbreviatedStep AxisSpecifier AxisName '::' | AbbreviatedAxisSpecifier Axes 'ancestor' | 'ancestor-or-self' | 'attribute' | 'child' | 'descendant' | 'descendant-or-self' | 'following' | 'following-sibling' | 'namespace' | 'parent | 'preceding' | 'preceding-sibling' | 'self' NodeTest NameTest | 'NodeType '(' ')' | 'processing-instruction' '(' Literal ')' Predicate '[' PredicateExpr ']' PredicateExpr Expr AbbreviatedAbsoluteLocationPath '//' RelativeLocationPath AbbreviatedRelativeLocationPath RelativeLocationPath AbbreviatedStep '.' | '..' AbbreviatedAxisSpecifier '@'? Expr OrExpr PrimaryExpr VariableReference | '(' Expr ')' | Literal | Number | FunctionCall FunctionCall FunctionName '(' (Argument ( ',' Argument)*)? ')' Argument Expr UnionExpr PathExpr | UnionExpr '|' PathExpr PathExpr LocationPath | FilterExpr | FilterExpr '/' RelativeLocationPath | FilterExpr '//' RelativeLocationPath

FilterExpr PrimaryExpr | FilterExpr Predicate OrExpr AndExpr | OrExpr 'or' AndExpr AndExpr EqualityExpr | AndExpr 'and' EqualityExpr EqualityExpr RelationalExpr | EqualityExpr '=' RelationalExpr | EqualityExpr '!=' RelationalExpr RelationalExpr AdditiveExpr | RelationalExpr '<' AdditiveExpr | RelationalExpr '>' AdditiveExpr | RelationalExpr '<=' AdditiveExpr | RelationalExpr '>=' AdditiveExpr AdditiveExpr MultiplicativeExpr | AdditiveExpr '+' MultiplicativeExpr | AdditiveExpr '-' MultiplicativeExpr MultiplicativeExpr UnaryExpr | MultiplicativeExpr MultiplyOperand UnaryExpr | MultiplicativeExpr 'div' UnaryExpr | MultiplicativeExpr 'mod' UnaryExpr UnaryExpr UnionExpr | '-' UnaryExpr ExprToken '(' | ')' | '[' | ']' | '.' | '..' | '@' | ',' | '::' | NameTest | NodeType | Operator | FunctionName | AxisName | Literal | Number | VariableRefence Literal '"' [^"]* '"' | "'" [^']* "'" Number Digits ('.'Digits?)? Digits [0-9]+ Operator OperatorName OperatorName | MultiplyOperator | '/' | '//' | '|' | +' | '-' | '=' | '<' | '<=' | '>' | '>=' MultiplyOperator 'and' | 'or' | 'mod' | 'div' FunctionName '*' VariableReference QName - NodeType NameTest '$'QName NodeType 'commen' | 'text' - 'processing-instruction' | 'node' ExprWhiteSpace S