The alternate-script property provides an alternate expression of the associated property value in a different language and/or script. The language tags of the alternate-script property and its associated property — as expressed by their respective in-scope xml:lang attributes — MUST NOT be the same.

This property is typically attached to creator and title properties for internationalization purposes.

The authority property identifies the system or scheme the referenced element's value is drawn from.

The belongs-to-collection property identifies the name of a collection to which the [=EPUB publication=] belongs. An EPUB publication MAY belong to one or more collections.

It is also possible to chain these properties using the refines attribute to indicate that one collection is itself a member of another collection.

To allow [=reading systems=] to organize collections and avoid naming collisions (e.g., unrelated collections might share a similar name, or different editions of a collection could be released), [=EPUB creators=] SHOULD provide an identifier that uniquely identifies the instance of the collection. The dcterms:identifier property must carry this identifier.

The collection MAY more precisely define its nature by attaching a collection-type property.

The position of the EPUB publication within the collection MAY be provided by attaching a group-position property.

The collection-type property indicates the form or nature of a collection.

When the collection-type value is drawn from a code list or other formal enumeration, [=EPUB creators=] SHOULD attach a scheme attribute to identify its source.

This specification also defines the following collection types when no scheme is specified:

series

A sequence of related works that are formally identified as a group, typically open-ended with works issued individually over time.

set

A finite collection of works that together constitute a single intellectual unit, typically issued together and able to be sold as a unit.

The display-seq property indicates the numeric position in which to display the current property relative to identical metadata properties.

This property only applies where precedence rules have not already been defined (e.g., precedence is given to creators based on their appearance in document order).

The group-position property indicates the numeric position in which the [=EPUB publication=] is ordered relative to other works belonging to the same group (whether all EPUB publications or not).

[=EPUB creators=] can attach the group-position property to any metadata property that establishes the group but it is typically associated with the belongs-to-collection property.

An EPUB publication can belong to more than one group.

The identifier-type property indicates the form or nature of an identifier.

When the identifier-type value is drawn from a code list or other formal enumeration, [=EPUB creators=] SHOULD attach a scheme attribute to identify its source.

The role property describes the role of a creator, contributor or publisher in the creation of an EPUB publication.

When the role value is drawn from a code list or other formal enumeration, [=EPUB creators=] SHOULD attach a scheme attribute to identify its source.

When attaching multiple roles to an individual or organization, the importance of the roles should match the document order of their containing meta elements (i.e., the first meta element encountered should contain the most important role).

The source-of property indicates a unique aspect of an adapted source resource that has been retained in the [=EPUB publication=].

This specification defines the pagination value to indicate that the referenced dc:source element is the source of the pagebreak properties defined in the content.

The term property provides a subject code.

The title-type property indicates the form or nature of a title.

When the title-type value is drawn from a code list or other formal enumeration, [=EPUB creators=] SHOULD attach a scheme attribute to identify its source. When a scheme is not specified, [=reading systems=] SHOULD recognize the following title type values: main, subtitle, short, collection, edition and expanded.