Module dev.metaschema.core

Package dev.metaschema.core.metapath.item

package dev.metaschema.core.metapath.item

Core interfaces and classes for the Metapath item type system.

This package provides the foundational abstractions for representing values in Metapath expressions, aligning with the XPath 3.1 Data Model. All Metapath values are either items or sequences of items.

Key interfaces include:

• IItem - Base interface for all Metapath items (atomic values, nodes, functions, arrays, and maps)
• ISequence - Ordered collection of items representing expression evaluation results
• ICollectionValue - Common interface for values that can be stored in arrays or maps
• IItemVisitor - Visitor pattern interface for traversing item hierarchies

The type system integrates with Metaschema data types defined in dev.metaschema.core.datatype while extending them to support the full XPath 3.1 type hierarchy including atomic items, node items, and function items.

See Also:

• XPath 3.1 Specification
• XPath 3.1 Data Model

Related Packages

Package	Description
dev.metaschema.core.metapath	Provides the core Metapath expression language implementation.
dev.metaschema.core.metapath.item.atomic	Atomic item types representing indivisible values in the Metapath type system.
dev.metaschema.core.metapath.item.function	Provides support for Metapath function items, including arrays and maps.
dev.metaschema.core.metapath.item.node	Node item types representing structured data in the Metapath type system.
dev.metaschema.core.metapath.format	Provides formatters for generating path expressions from Metaschema node items.
dev.metaschema.core.metapath.function	Provides the core framework for defining and executing Metapath functions.
dev.metaschema.core.metapath.type	Provides support for Metapath type system and sequence type testing.

Class	Description
DefaultItemWriter	Produces a textual representation of a Metapath sequence.
ICollectionValue	A data value that can be a value in a Metapath array or map.
IItem	The base interface inherited by all Metapath item implementations.
IItemVisitor	Use to visit the major types of items.
IItemWriter	Supports writing different types of items using a visitor pattern.
ISequence<ITEM extends IItem>	Represents an ordered collection of Metapath expression results.
ItemUtils	Provides a variety of utilities for working with Metapath items.