The following elements from the Dublin Core Terms namespace are allowed in DocBoo Publishers:

dcterms:abstract

A summary of the resource.

dcterms:accessRights

Information about who can access the resource or an indication of its security status. Access Rights may include information regarding access or restrictions based on privacy, security, or other policies.

dcterms:accrualMethod

The method by which items are added to a collection.

dcterms:accrualPeriodicity

The frequency with which items are added to a collection.

dcterms:accrualPolicy

The policy governing the addition of items to a collection.

dcterms:alternative

An alternative name for the resource. The distinction between titles and alternative titles is application-specific.

dcterms:audience

A class of entity for whom the resource is intended or useful.

dcterms:available

Date (often a range) that the resource became or will become available.

dcterms:bibliographicCitation

A bibliographic reference for the resource. Recommended practice is to include sufficient bibliographic detail to identify the resource as unambiguously as possible.

dcterms:conformsTo

An established standard to which the described resource conforms.

dcterms:contributor

An entity responsible for making contributions to the resource. Examples of a Contributor include a person, an organization, or a service. Typically, the name of a Contributor should be used to indicate the entity.

dcterms:coverage

The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant. Spatial topic and spatial applicability may be a named place or a location specified by its geographic coordinates. Temporal topic may be a named period, date, or date range. A jurisdiction may be a named administrative entity or a geographic place to which the resource applies. Recommended best practice is to use a controlled vocabulary such as the Thesaurus of Geographic Names [TGN]. Where appropriate, named places or time periods can be used in preference to numeric identifiers such as sets of coordinates or date ranges.

dcterms:created

Date of creation of the resource.

dcterms:creator

An entity primarily responsible for making the resource. Examples of a Creator include a person, an organization, or a service. Typically, the name of a Creator should be used to indicate the entity.

dcterms:date

A point or period of time associated with an event in the lifecycle of the resource. Date may be used to express temporal information at any level of granularity. Recommended best practice is to use an encoding scheme, such as the W3CDTF profile of ISO 8601 [W3CDTF].

dcterms:dateAccepted

Date of acceptance of the resource. Examples of resources to which a Date Accepted may be relevant are a thesis (accepted by a university department) or an article (accepted by a journal).

dcterms:dateCopyrighted

Date of copyright.

dcterms:dateSubmitted

Date of submission of the resource. Examples of resources to which a Date Submitted may be relevant are a thesis (submitted to a university department) or an article (submitted to a journal).

dcterms:description

An account of the resource. Description may include but is not limited to: an abstract, a table of contents, a graphical representation, or a free-text account of the resource.

dcterms:educationLevel

A class of entity, defined in terms of progression through an educational or training context, for which the described resource is intended.

dcterms:extent

The size or duration of the resource.

dcterms:format

The file format, physical medium, or dimensions of the resource. Examples of dimensions include size and duration. Recommended best practice is to use a controlled vocabulary such as the list of Internet Media Types [MIME].

dcterms:hasFormat

A related resource that is substantially the same as the pre-existing described resource, but in another format.

dcterms:hasPart

A related resource that is included either physically or logically in the described resource.

dcterms:hasVersion

A related resource that is a version, edition, or adaptation of the described resource.

dcterms:identifier

An unambiguous reference to the resource within a given context. Recommended best practice is to identify the resource by means of a string conforming to a formal identification system.

dcterms:instructionalMethod

A process, used to engender knowledge, attitudes and skills, that the described resource is designed to support. Instructional Method will typically include ways of presenting instructional materials or conducting instructional activities, patterns of learner-to-learner and learner-to-instructor interactions, and mechanisms by which group and individual levels of learning are measured. Instructional methods include all aspects of the instruction and learning processes from planning and implementation through evaluation and feedback.

dcterms:isFormatOf

A related resource that is substantially the same as the described resource, but in another format.

dcterms:isPartOf

A related resource in which the described resource is physically or logically included.

dcterms:isReferencedBy

A related resource that references, cites, or otherwise points to the described resource.

dcterms:isReplacedBy

A related resource that supplants, displaces, or supersedes the described resource.

dcterms:isRequiredBy

A related resource that requires the described resource to support its function, delivery, or coherence.

dcterms:isVersionOf

A related resource of which the described resource is a version, edition, or adaptation. Changes in version imply substantive changes in content rather than differences in format.

dcterms:issued

Date of formal issuance (e.g., publication) of the resource.

dcterms:language

A language of the resource. Recommended best practice is to use a controlled vocabulary such as RFC 4646 [RFC4646].

dcterms:license

A legal document giving official permission to do something with the resource.

dcterms:mediator

An entity that mediates access to the resource and for whom the resource is intended or useful. In an educational context, a mediator might be a parent, teacher, teaching assistant, or care-giver.

dcterms:medium

The material or physical carrier of the resource.

dcterms:modified

Date on which the resource was changed.

dcterms:provenance

A statement of any changes in ownership and custody of the resource since its creation that are significant for its authenticity, integrity, and interpretation. The statement may include a description of any changes successive custodians made to the resource.

dcterms:publisher

An entity responsible for making the resource available. Examples of a Publisher include a person, an organization, or a service. Typically, the name of a Publisher should be used to indicate the entity.

dcterms:references

A related resource that is referenced, cited, or otherwise pointed to by the described resource.

dcterms:relation

A related resource. Recommended best practice is to identify the related resource by means of a string conforming to a formal identification system.

dcterms:replaces

A related resource that is supplanted, displaced, or superseded by the described resource.

dcterms:requires

A related resource that is required by the described resource to support its function, delivery, or coherence.

dcterms:rights

Information about rights held in and over the resource. Typically, rights information includes a statement about various property rights associated with the resource, including intellectual property rights.

dcterms:rightsHolder

A person or organization owning or managing rights over the resource.

dcterms:source

A related resource from which the described resource is derived. The described resource may be derived from the related resource in whole or in part. Recommended best practice is to identify the related resource by means of a string conforming to a formal identification system.

dcterms:spatial

Spatial characteristics of the resource.

dcterms:subject

The topic of the resource. Typically, the subject will be represented using keywords, key phrases, or classification codes. Recommended best practice is to use a controlled vocabulary. To describe the spatial or temporal topic of the resource, use the Coverage element.

dcterms:tableOfContents

A list of subunits of the resource.

dcterms:temporal

Temporal characteristics of the resource.

dcterms:title

A name given to the resource.

dcterms:type

The nature or genre of the resource. Recommended best practice is to use a controlled vocabulary such as the DCMI Type Vocabulary [DCMITYPE]. To describe the file format, physical medium, or dimensions of the resource, use the Format element.

dcterms:valid

Date (often a range) of validity of a resource.

DocBook doesn't define the semantics of these elements. Consult the DCMI Metadata Terms documentation for more information.