ADL Search bucket description

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ADL has defined a set of nine standard search buckets. The syntax and semantics are defined by the DTD ADL-query.dtd. When setting up your ADL collection, you must provide mappings between the search buckets and your own specific metadata. The ADL search buckets are listed below.

Geographic locations

Internal name	adl:geographic locations
Type	spatial
Operators	contains, is-contained-in, overlaps
Content	The item's spatial footprint, i.e., an approximation of the subset of the Earth's surface to which the item is relevant, expressed as any of several types of geometric regions defined in WGS84 latitude/longitude coordinates. Learn more, see adl:geographic locations.

Dates

Internal namea	adl:dates
Type	temporal
Operators	contains, is-contained-in, overlaps
Content	The item's temporal footprint, i.e., the range of calendar dates to which the item is relevant.

Types

Internal name	adl:types
Type	hierarchical
Operators	is-a
Content	Terms drawn from the ADL Object Type Thesaurus identifying the meaning or content of the item.

Formats

Internal name	adl:formats
Type	hierarchical
Operators	is-a
Content	Terms drawn from the ADL Object Format Thesaurus identifying the form or representation of the item.

Title

Internal name	adl:title
Type	textual
Operators	contains-all-words, contains-any-words, contains-phrase
Content	The item's title. This bucket is a subset of the "Subject-related text" bucket.

Originators

Internal name	adl:originators
Type	textual
Operators	contains-all-words, contains-any-words, contains-phrase
Content	Names of entities related to the origination of the item (authors, publishers, distributors, etc.).

Assigned terms

Internal name	adl:assigned terms
Type	textual
Operators	contains-all-words, contains-any-words, contains-phrase
Content	Subject-related terms from controlled vocabularies. This bucket is a subset of the "Subject-related text" bucket.

Subject-related text

Internal name	adl:subject-related text
Type	textual
Operators	contains-all-words, contains-any-words, contains-phrase
Content	Text indicative of the subject of the item, not necessarily from controlled vocabularies. This bucket is a superset of the "Titles" and "Assigned terms" buckets.

Identifiers

Internal name	adl:identifiers
Type	identification
Operators	matches
Content	Item names and codes that serve as unique identifiers.