| START | ::= | Expr <EOF> |
| ModuleDecl | ::= | "module" "namespace" NCName "=" URILiteral Separator |
| Separator | ::= | ";" |
| DefaultCollationDecl | ::= | "declare" "default" "collation" URILiteral |
| BaseURIDecl | ::= | "declare" "base-uri" URILiteral |
| ConstructionDecl | ::= | "declare" "construction" ( "strip" | "preserve" ) |
| OrderingModeDecl | ::= | "declare" "ordering" ( "ordered" | "unordered" ) |
| EmptyOrderDecl | ::= | "declare" "default" "order" "empty" ( <Greatest> | <Least> ) |
| CopyNamespacesDecl | ::= | "declare" "copy-namespaces" PreserveMode "," InheritMode |
| PreserveMode | ::= | ( "preserve" | "no-preserve" ) |
| InheritMode | ::= | ( "inherit" | "no-inherit" ) |
| SchemaImport | ::= | "import" "schema" ( SchemaPrefix )? URILiteral ( "at" URILiteral ( "," URILiteral )* )? |
| SchemaPrefix | ::= | ( ( "namespace" NCName "=" ) | ( "default" "element" "namespace" ) ) |
| ModuleImport | ::= | "import" "module" ( "namespace" NCName "=" )? URILiteral ( "at" URILiteral ( "," URILiteral )* )? |
| NamespaceDecl | ::= | "declare" "namespace" NCName "=" URILiteral |
| DefaultNamespaceDecl | ::= | "declare" "default" ( "element" | "function" ) "namespace" URILiteral |
| VarDecl | ::= | "declare" "variable" "$" QName ( TypeDeclaration )? ( ( ":=" ExprSingle ) | ( <External> ) ) |
| FunctionDecl | ::= | "declare" "function" FunctionQName "(" ( ParamList )? ")" ( "as" SequenceType )? ( EnclosedExpr | <External> ) |
| ParamList | ::= | Param ( "," Param )* |
| Param | ::= | "$" QName ( TypeDeclaration )? |
| EnclosedExpr | ::= | <Lbrace> Expr <Rbrace> |
| OptionDecl | ::= | "declare" "option" QName <StringLiteral> |
| Expr | ::= | ExprSingle ( "," ExprSingle )* |
| ExprSingle | ::= | ( FLWORExpr10 | QuantifiedExpr | TypeswitchExpr | IfExpr | OrExpr ) |
| FLWORExpr10 | ::= | ( ForClause | LetClause ) "return" ExprSingle |
| ForClause | ::= | "for" "$" VarName ( TypeDeclaration )? ( PositionalVar )? "in" ExprSingle |
| PositionalVar | ::= | "at" "$" VarName |
| LetClause | ::= | "let" ( "$" VarName ( TypeDeclaration )? ) ":=" ExprSingle |
| OrderByClause | ::= | ( ( "order" "by" ) | ( "stable" "order" "by" ) ) OrderSpecList |
| OrderSpecList | ::= | OrderSpec ( "," OrderSpec )* |
| OrderSpec | ::= | ExprSingle OrderModifier |
| OrderModifier | ::= | ( ( <Ascending> | <Descending> ) )? ( "empty" ( <Greatest> | <Least> ) )? ( "collation" URILiteral )? |
| QuantifiedExpr | ::= | ( "some" | "every" ) "$" VarName ( TypeDeclaration )? "in" ExprSingle ( "," "$" VarName ( TypeDeclaration )? "in" ExprSingle )* "satisfies" ExprSingle |
| TypeswitchExpr | ::= | "typeswitch" "(" Expr ")" ( CaseClause )+ "default" "$" VarName "return" ExprSingle |
| CaseClause | ::= | "case" "$" VarName "as" SequenceType "return" ExprSingle |
| IfExpr | ::= | "if" "(" Expr ")" "then" ExprSingle "else" ExprSingle |
| OperatorExpr | ::= | OrExpr |
| OrExpr | ::= | AndExpr ( "or" AndExpr )* |
| AndExpr | ::= | CastableExpr ( "and" CastableExpr )* |
| CastableExpr | ::= | CastExpr ( ( "castable" "as" SingleType ) )? |
| CastExpr | ::= | ValueExpr ( ( "cast" "as" SingleType ) )? |
| ValueExpr | ::= | ( ValidateExpr | StepExpr | ExtensionExpr ) |
| ValidateExpr | ::= | "validate" ( ValidationMode )? <Lbrace> Expr <Rbrace> |
| ValidationMode | ::= | ( "lax" | "strict" ) |
| ExtensionExpr | ::= | ( Pragma )+ <Lbrace> ( Expr )? <Rbrace> |
| Pragma | ::= | <PragmaOpen> ( <S> )? QName ( <S> PragmaContents )? <PragmaClose> |
| PragmaContents | ::= | ( <Char> )* |
| StepExpr | ::= | ( PrimaryExpr | AxisStep ) |
| AxisStep | ::= | ( ReverseStep | ForwardStep ) |
| ForwardStep | ::= | ( ForwardAxis NodeTest ) |
| ForwardAxis | ::= | ( ( "child" "::" ) | ( "descendant" "::" ) | ( "attribute" "::" ) | ( "self" "::" ) | ( "descendant-or-self" "::" ) | ( "namespace" "::" ) ) |
| ReverseStep | ::= | ( ReverseAxis NodeTest ) |
| ReverseAxis | ::= | ( ( "parent" "::" ) | ( "ancestor" "::" ) | ( "ancestor-or-self" "::" ) ) |
| NodeTest | ::= | ( KindTest | NameTest ) |
| NameTest | ::= | ( QName | Wildcard ) |
| Wildcard | ::= | ( "*" | <NCNameColonStar> | <StarColonNCName> ) |
| PrimaryExpr | ::= | ( Literal | VarRef | ParenthesizedExpr | FunctionCall | OrderedExpr | UnorderedExpr | Constructor ) |
| Literal | ::= | ( NumericLiteral | <StringLiteral> ) |
| NumericLiteral | ::= | ( <IntegerLiteral> | <DecimalLiteral> | <DoubleLiteral> ) |
| VarRef | ::= | "$" VarName |
| VarName | ::= | QName |
| ParenthesizedExpr | ::= | "(" ( Expr )? ")" |
| OrderedExpr | ::= | "ordered" <Lbrace> Expr <Rbrace> |
| UnorderedExpr | ::= | "unordered" <Lbrace> Expr <Rbrace> |
| FunctionCall | ::= | FunctionQName ( "(" ( ExprSingle ( "," ExprSingle )* )? ")" ) |
| Constructor | ::= | ComputedConstructor |
| ComputedConstructor | ::= | ( CompDocConstructor | CompElemConstructor | CompAttrConstructor | CompTextConstructor | CompCommentConstructor | CompPIConstructor ) |
| CompDocConstructor | ::= | "document" <Lbrace> Expr <Rbrace> |
| CompElemConstructor | ::= | "element" ( QName | ( <Lbrace> Expr <Rbrace> ) ) <Lbrace> ContentExpr <Rbrace> <Lbrace> LocalNamespaceDecls <Rbrace> |
| LocalNamespaceDecls | ::= | ( LocalNamespaceDecl )* |
| LocalNamespaceDecl | ::= | "namespace" NCName <Lbrace> URILiteral <Rbrace> |
| ContentExpr | ::= | Expr |
| CompAttrConstructor | ::= | "attribute" ( QName | ( <Lbrace> Expr <Rbrace> ) ) <Lbrace> Expr <Rbrace> |
| CompTextConstructor | ::= | "text" <Lbrace> Expr <Rbrace> |
| CompCommentConstructor | ::= | "comment" <Lbrace> Expr <Rbrace> |
| CompPIConstructor | ::= | "processing-instruction" ( NCName | ( <Lbrace> Expr <Rbrace> ) ) <Lbrace> ( Expr )? <Rbrace> |
| SingleType | ::= | AtomicType ( "?" )? |
| TypeDeclaration | ::= | "as" SequenceType |
| SequenceType | ::= | ( ( "empty-sequence" "(" ")" ) | ( ItemType ( OccurrenceIndicator )? ) ) |
| OccurrenceIndicator | ::= | ( "?" | "*" | <Plus> ) |
| ItemType | ::= | ( KindTest | ( "item" "(" ")" ) | AtomicType ) |
| AtomicType | ::= | QName |
| KindTest | ::= | ( DocumentTest | ElementTest | AttributeTest | SchemaElementTest | SchemaAttributeTest | PITest | CommentTest | TextTest | AnyKindTest ) |
| AnyKindTest | ::= | "node" "(" ")" |
| DocumentTest | ::= | "document-node" "(" ( ( ElementTest | SchemaElementTest ) )? ")" |
| TextTest | ::= | "text" "(" ")" |
| CommentTest | ::= | "comment" "(" ")" |
| PITest | ::= | "processing-instruction" "(" ( ( NCName | <StringLiteral> ) )? ")" |
| AttributeTest | ::= | "attribute" "(" ( AttribNameOrWildcard ( "," TypeName )? )? ")" |
| AttribNameOrWildcard | ::= | ( AttributeName | "*" ) |
| SchemaAttributeTest | ::= | "schema-attribute" "(" AttributeDeclaration ")" |
| AttributeDeclaration | ::= | AttributeName |
| ElementTest | ::= | "element" "(" ( ElementNameOrWildcard ( "," TypeName ( "?" )? )? )? ")" |
| ElementNameOrWildcard | ::= | ( ElementName | "*" ) |
| SchemaElementTest | ::= | "schema-element" "(" ElementDeclaration ")" |
| ElementDeclaration | ::= | ElementName |
| AttributeName | ::= | QName |
| ElementName | ::= | QName |
| TypeName | ::= | QName |
| URILiteral | ::= | <StringLiteral> |
| NCName | ::= | QName |
| QName | ::= | ( FunctionQName | "attribute" | "comment" | "document-node" | "element" | "empty-sequence" | "if" | "item" | "node" | "processing-instruction" | "schema-attribute" | "schema-element" | "text" | "typeswitch" ) |
| FunctionQName | ::= | ( <QNameToken> | <Ascending> | <Descending> | <External> | <Greatest> | <Least> | "ancestor" | "ancestor-or-self" | "and" | "as" | "at" | "base-uri" | "by" | "case" | "cast" | "castable" | "child" | "collation" | "construction" | "copy-namespaces" | "declare" | "default" | "descendant" | "descendant-or-self" | "document" | "else" | "empty" | "every" | "for" | "function" | "import" | "in" | "inherit" | "lax" | "let" | "module" | "namespace" | "no-inherit" | "no-preserve" | "option" | "or" | "order" | "ordered" | "ordering" | "parent" | "preserve" | "return" | "satisfies" | "schema" | "self" | "some" | "stable" | "strict" | "strip" | "then" | "unordered" | "validate" | "variable" ) |