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Biblio-Thesaurus-0.15
River stage one • 2 direct dependents • 2 total dependents
/ Biblio::Thesaurus

NAME

Biblio::Thesaurus internals

ABSTRACT

This POD documents the internals of the thesaurus object.

DESCRIPTION

The object itself is a reference to an hash table. We will call properties to each key. This way, the name property is accessible using $obj-{name}>.

Follows a section for each property accessible in the object.

version

The version property is the Biblio::Thesaurus version for the module which created the object. This property value is the same of the current module version unless the object was created using the thesaurusRetrieve constructor.

baselang

This property holds the name of the default language (relation name) for the thesaurus. If it is not defined, then this property returns an interrogation mark (?).

name

When showing the thesaurus without a search term, the module shows the top for the thesaurus. This special term is stored in this attribute. Unless it is defined, the default top term is _top_.

inverses

This property is a reference to an hash table. Keys are relation identifiers, and values are the respective inverse. Note that it is required that each key is too a value, and vice-versa. This means than when defining A is inverse of B it should be added to the hash:

( 'A' => 'B', 'B' => 'A' )

externals

To define external relations (relations not to terms) it should be added to the externals property one more entry. This property is a reference to an hash table where keys are the external relation identifiers and values are ignored (use the natural 1 value).

languages

As in the externals property, this one stores identifiers for language pseudo-relations. This property is a reference to an hash table where keys are the language identifiers and values are ignored (use the natural 1 value).

descriptions

This property holds a reference to an hash table which maps relation identifiers to relation descriptions. On multi-language thesaurus, descriptions in the base language are defined normally:

$obj->{descriptions}{RT} = "related term";

Descriptions for different languages use a relation identifier, a space and a language identifier as in:

$obj->{descriptions}{'RT PT'} = "termo relacionado";

defined

This property holds a reference to a big hash table. It maps normalized terms on their non normalized version (how they appear in the ISO file). On multi-language thesaurus, it maps non-base language terms to the normalized base language terms.

thesaurus

This is not really the name of the property. For each language identifier the object contains a property with that name that holds the thesaurus in that specific language as it follows: