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This grammar is extracted from the official W3C XPath 1.0 specifications where it is spread all across the document.
[1] LocationPath ::= RelativeLocationPath | AbsoluteLocationPath [2] AbsoluteLocationPath ::= '/' RelativeLocationPath? | AbbreviatedAbsoluteLocationPath [3] RelativeLocationPath ::= Step | RelativeLocationPath '/' Step | AbbreviatedRelativeLocationPath [4] Step ::= AxisSpecifier NodeTest Predicate* | AbbreviatedStep [5] AxisSpecifier ::= AxisName '::' | AbbreviatedAxisSpecifier [6] AxisName ::= \ \ 'ancestor' | \ \ 'ancestor-or-self' | \ \ 'attribute' | \ \ 'child' | \ \ 'descendant' | \ \ 'descendant-or-self' | \ \ 'following' | \ \ 'following-sibling' | \ \ 'namespace' | \ \ 'parent' | \ \ 'preceding' | \ \ 'preceding-sibling' | \ \ 'self' [7] NodeTest ::= NameTest | NodeType '(' ')' | 'processing-instruction' '(' Literal ')' [8] Predicate ::= '[' PredicateExpr ']' [9] PredicateExpr ::= Expr [10] AbbreviatedAbsoluteLocationPath ::= '//' RelativeLocationPath [11] AbbreviatedRelativeLocationPath ::= RelativeLocationPath '//' Step [12] AbbreviatedStep ::= '.' | '..' [13] AbbreviatedAxisSpecifier ::= '@'? [14] Expr ::= OrExpr [15] PrimaryExpr ::= VariableReference | '(' Expr ')' | Literal | Number | FunctionCall [16] FunctionCall ::= FunctionName '(' ( Argument ( ',' Argument )* )? ')' [17] Argument ::= Expr [18] UnionExpr ::= PathExpr | UnionExpr '|' PathExpr [19] PathExpr ::= LocationPath | FilterExpr | FilterExpr '/' RelativeLocationPath | FilterExpr '//' RelativeLocationPath [20] FilterExpr ::= PrimaryExpr | FilterExpr Predicate [21] OrExpr ::= AndExpr | OrExpr 'or' AndExpr [22] AndExpr ::= EqualityExpr | AndExpr 'and' EqualityExpr [23] EqualityExpr ::= RelationalExpr | EqualityExpr '=' RelationalExpr | EqualityExpr '!=' RelationalExpr [24] RelationalExpr ::= AdditiveExpr | RelationalExpr '<' AdditiveExpr | RelationalExpr '>' AdditiveExpr | RelationalExpr '<=' AdditiveExpr | RelationalExpr '>=' AdditiveExpr [25] AdditiveExpr ::= MultiplicativeExpr | AdditiveExpr '+' MultiplicativeExpr | AdditiveExpr '-' MultiplicativeExpr [26] MultiplicativeExpr ::= UnaryExpr | MultiplicativeExpr MultiplyOperator UnaryExpr | MultiplicativeExpr 'div' UnaryExpr | MultiplicativeExpr 'mod' UnaryExpr [27] UnaryExpr ::= UnionExpr | '-' UnaryExpr [28] ExprToken ::= '(' | ')' | '[' | ']' | '.' | '..' | '@' | ',' | '::' | NameTest | NodeType | Operator | FunctionName | AxisName | Literal | Number | VariableReference [29] Literal ::= '"' [^"]* '"' | "'" [^']* "'" [30] Number ::= Digits ('.' Digits?)? | '.' Digits [31] Digits ::= [0-9]+ [32] Operator ::= OperatorName | MultiplyOperator | '/' | '//' | '|' | '+' | '-' | '=' | '!=' | '<' | '<=' | '>' | '>=' [33] OperatorName ::= 'and' | 'or' | 'mod' | 'div' [34] MultiplyOperator ::= '*' [35] FunctionName ::= QName - NodeType [36] VariableReference ::= '$' QName [37] NameTest ::= '*' | NCName ':' '*' | QName [38] NodeType ::= 'comment' | 'text' | 'processing-instruction' | 'node' [39] ExprWhitespace ::= S QName, NCName and S are defined in XML 1.0 Grammar.
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