AttrMap

AttrMap is a term used in computing to describe a data structure that maps attribute names to values. In many languages and frameworks, an AttrMap is implemented as a dictionary, map, or associative array where keys are attribute identifiers (typically strings) and values are the corresponding attribute values. This construct is commonly used to represent the attributes attached to an element in markup languages such as HTML or XML, or to store metadata and properties in various components and documents.

Attribute maps may be mutable or immutable, depending on the language and intended usage. Implementations often support operations such as insertion or updating of a key-value pair, removal of an attribute, and lookup by key. Some designs normalize keys to a canonical form, for example by converting to lower case for HTML attributes or by preserving namespaces to distinguish attributes with the same local name from different vocabularies. Values may be strings, booleans, numbers, or composite types, reflecting the semantics of the underlying attributes. In boolean attributes, the presence of the attribute may imply a true value, while its absence implies false, depending on the specification.

AttrMap objects are typically serialized back to markup or other representations for rendering, storage, or transmission. They are used in parsing and rendering pipelines, templating engines, UI frameworks, and document processing tools to manage attribute data in a structured and uniform way.