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## Package org.exist.xquery

Classes that implement the XQuery/XPath execution model.

See:
Description

Interface Summary
CompiledXQuery |
Constants | Declares various constants and flags used by the query engine: axis specifiers, operators.
Expression | Base interface implemented by all classes which are part of an XQuery/XPath expression.
ExpressionVisitor | Defines a visitor to be used for traversing and analyzing the expression tree.
ExternalModule | An external library module implemented in XQuery and loaded through the "import module" directive.
InternalModule | Defines an internal module implemented in Java.
Module | Defines an XQuery library module.
NodeSelector |
NodeTest |

Class Summary
AbstractExpression |
AbstractInternalModule | Abstract base class for an `InternalModule`.
AnalyzeContextInfo | Holds context information and execution hints for XQuery expressions.
AncestorSelector |
AnyNodeTest |
AtomicToString |
Atomize |
AttributeConstructor | Node constructor for attribute nodes.
BasicExpressionVisitor | Basic implementation of the `ExpressionVisitor` interface.
BasicFunction | Abstract base class for simple functions.
BatchTransactionPragma |
BinaryOp |
BindingExpression | Abstract superclass for the variable binding expressions "for" and "let".
CachedResult | This class is used to hold an intermediate result that can be cached.
Cardinality | Defines occurrence indicators (*,?,+).
CastableExpression | Implements the "castable as" XQuery expression.
CastExpression | CastExpression represents cast expressions as well as all type constructors.
CDATAConstructor | Constructs an in-memory CDATA node.
ChildSelector |
CombiningExpression | Abstract base class for the XQuery/XPath combining operators "union", "intersect" and "except".
CommentConstructor |
ConditionalExpression | XQuery if ...
DeferredFunctionCall |
Dependency | Defines bit flags to indicate, upon which parts of the execution context an expression depends (`Expression.getDependencies()`).
DescendantOrSelfSelector |
DescendantSelector |
DocumentConstructor | Implements a dynamic document constructor.
DynamicAttributeConstructor | Represents a dynamic attribute constructor.
DynamicCardinalityCheck | Runtime-check for the cardinality of a function parameter.
DynamicCommentConstructor | Implements a dynamic comment constructor.
DynamicNameCheck | Check element or attribute name to match sequence type.
DynamicPIConstructor | Dynamic constructor for processing instruction nodes.
DynamicTextConstructor | Implements a dynamic text constructor.
DynamicTypeCheck | Check a function parameter type at runtime.
ElementConstructor | Constructor for element nodes.
EnclosedExpr | Represents an enclosed expression `{expr}` inside element content.
Except |
ExtensionExpression | Implements an XQuery extension expression.
ExternalModuleImpl | Default implementation of an `ExternalModule`.
FilteredExpression | FilteredExpression represents a primary expression with a predicate.
ForExpr | Represents an XQuery "for" expression.
Function | Abstract base class for all built-in and user-defined functions.
FunctionCall | Represents a call to a user-defined function `UserDefinedFunction`.
FunctionDef | A function definition, consisting of a signature and the implementing class.
FunctionFactory |
FunctionId | Used to uniquely identify a function by its function name and arity.
FunctionSignature | Describes the signature of a built-in or user-defined function, i.e.
GeneralComparison | A general XQuery/XPath2 comparison expression.
InstanceOfExpression | Implements the XQuery "instance of" operator.
InternalFunctionCall | Wrapper for internal modules in order to perform access control checks on internal module function calls.
Intersection |
JavaCall | A special function call to a Java method or constructor.
LetExpr | Implements an XQuery let-expression.
LiteralValue | A literal value, i.e.
LocalVariable | Represents a local variable as declared by for and let.
LocationStep | Processes all location path steps (like descendant::*, ancestor::XXX).
LogicalOp | Base class for the boolean operators "and" and "or".
ModuleContext | Subclass of `XQueryContext` for imported modules.
NamespaceConstructor | Implements a dynamic namespace constructor.
NameTest |
NodeComparison | Implements node comparisons: is, isnot, <<, >>.
NodeConstructor | Abstract base class for all node constructors.
OpAnd | Boolean operator "and".
OpNumeric | numeric operation on two operands by +, -, *, div, mod etc..
OpOr | Boolean operator "or".
Option | Represents an XQuery option declared via "declare option".
OrderSpec | An XQuery order specifier as specified in an "order by" clause.
ParentSelector |
PathExpr | PathExpr is just a sequence of XQuery/XPath expressions, which will be called step by step.
PIConstructor | Constructor for processing-instruction nodes.
Pragma |
Predicate | Handles predicate expressions.
Profiler | XQuery profiling output.
QuantifiedExpression | Represents a quantified expression: "some ...
RangeExpression | An XQuery range expression, like "1 to 10".
RootNode | Reads a set of document root nodes from the context.
SelfSelector |
SequenceConstructor | An XQuery sequence constructor ",".
SimpleStep | Represents a primary expression in a simple path step like foo//$x.
Step |
TextConstructor | Direct constructor for text nodes.
TimerPragma |
TreatAsExpression |
TypeswitchExpression | Implements the XQuery typeswitch construct.
TypeTest | Tests if a node is of a given node type.
UnaryExpr | A unary minus or plus.
Union |
UntypedValueCheck | Runtime-value check for untyped atomic values.
UserDefinedFunction |
ValueComparison |
Variable | An XQuery/XPath variable, consisting of a QName and a value.
VariableDeclaration | A global variable declaration (with: declare variable).
VariableReference | Represents a reference to an in-scope variable.
XPathUtil |
XQuery |
XQueryContext | The current XQuery execution context.
XQueryWatchDog |

Exception Summary
StaticXQueryException |
TerminatedException |
TerminatedException.SizeLimitException |
TerminatedException.TimeoutException |
XPathException |

## Package org.exist.xquery Description

Classes that implement the XQuery/XPath execution model. Every query is translated into a graph of expression objects which can be repeatedly executed.

The base class for all expression objects is `Expression`.

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Copyright (C) Wolfgang Meier. All rights reserved.