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Expr ← Path Type XPath?
Path ← "/"
Type ← WildCard / "node" / "way" / "relation"
XPath ← Bbox (Tag Child?)? / Bbox Child Tag? / Tag (Bbox Child?)? / Tag Child Bbox? / Child (Tag Bbox?)? / Child Bbox Tag?
Bbox ← LeftBracket BboxPredicate RightBracket
Tag ← LeftBracket TagPredicate RightBracket
Child ← LeftBracket ChildPredicate RightBracket
BboxPredicate ← [bB] [bB] [oO] [xX] Equals Left Komma Bottom Komma Right Komma Top
Left ← Coordinate
Bottom ← Coordinate
Right ← Coordinate
Top ← Coordinate
Coordinate ← Sign? Double / Sign? Integer
TagPredicate ← Keys Equals Vals
Keys ← Key (Pipe Key)*
Key ← Chars
Vals ← WildCard / Val
Val ← Chars Pipe Keys / Chars
Chars ← Char (Char)*
SpecialChar ← Escape Special
Special ← Equals / LeftBracket / RightBracket / LeftParent / RightParent / Pipe / Backslash
Space ← [ U+0020 ]
Equals ← [ U+003D ]
Escape ← [ U+005C ]
LeftBracket ← [ U+005B ]
RightBracket ← [ U+005D ]
LeftParent ← [ U+0028 ]
RightParent ← [ U+0029 ]
Backslash ← [ U+005C ]
Pipe ← [ U+007C ]
Char ← SpecialChar / [U+0021-U+0027] / [U+002B-U+003C] / [U+003E-U+005A] / [U+005C] / [U+005E-U+007B] / [U+007D-U+FFFF]
ChildPredicate ← "nd" / "not(nd)" / "tag" / "not(tag)" / "not(tag)" / "way" / "not(way)" / "node" / "not(node)" / "relation" / "not(relation)"
Integer ← "0" / Sign? [1-9] [0-9]*
Double ← Integer "." [0-9]*
Sign ← "+" / "-"
Empty ← ""
Dot ← "."
Komma ← ","
WildCard ← "*"
CR ← [U+0013]
LF ← [U+000A]
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