The EPUB Working Group intends to exit the Candidate Recommendation stage and submit the EPUB 3.3 specification for consideration as a W3C Proposed Recommendation after documenting implementation of each feature.
For this specification to advance to Proposed Recommendation, it has to be proven that metadata defined and required in this specification have sufficient usage by the target communities. This metadata falls into two categories:
- metadata for expressing information about the publication in the package document; and
- metadata for expressing preferred rendering of the content
Usage of these properties, as listed in the following tables, means that the organizations regularly include the metadata in the package document (for publishers) or use them in bookshelves, content rendering, etc. (for reading system developers).
The following table lists organizations that have stated that they are currently using the meta properties in production.
Meta properties are expressed in the
meta element's property attribute.
| Property | Used By |
|---|---|
| alternate-script |
|
| authority |
|
| belongs-to-collection |
|
| collection-type |
|
| display-seq |
|
| file-as |
|
| group-position |
|
| identifier-type |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
|
| role |
|
| source-of |
|
| term |
|
| title-type |
|
The following table lists organizations that have stated that they are currently using the link relationships in production.
Link relationships are expressed in the
link element's rel attribute.
| Property | Used By |
|---|---|
| alternate |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
|
| record |
|
| voicing |
|
|
This property deprecated and is no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
The following table lists organizations that have stated that they are currently using the link properties in production.
Link properties are expressed in the
link element's properties attribute.
| Property | Used By |
|---|---|
| onix |
|
The following table lists organizations that have stated that they are currently using the general package rendering properties in production.
General package rendering properties are expressed both globally in the
meta element's property attribute
and as overrides in the
itemref element's properties attribute.
| Property | Used By |
|---|---|
| rendition:flow |
|
| rendition:flow-auto |
|
| rendition:flow-paginated |
|
| rendition:flow-scrolled-continuous |
|
| rendition:flow-scrolled-doc |
|
| rendition:align-x-center |
|
The following table lists organizations that have stated that they are currently using the fixed-layout rendering properties in production.
Fixed-layout properties are expressed both globally in the
meta element's property attribute
and as overrides in the
itemref element's properties attribute.
| Property | Used By |
|---|---|
| rendition:layout |
|
| rendition:layout-pre-paginated |
|
| rendition:layout-reflowable |
|
| rendition:orientation |
|
| rendition:orientation-auto |
|
| rendition:orientation-landscape |
|
| rendition:orientation-portrait |
|
| rendition:spread |
|
| rendition:spread-auto |
|
| rendition:spread-both |
|
| rendition:spread-landscape |
|
| rendition:spread-none |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
|
| rendition:page-spread-center |
|
| rendition:page-spread-left |
|
| rendition:page-spread-right |
|
|
This property is deprecated and no longer recommended for use in EPUB publications. It is only listed for completeness of reporting. |
The following table lists organizations that have stated that they are currently using the manifest properties in production.
Manifest properties are expressed in the
item element's properties attribute.
| Property | Used By |
|---|---|
| cover-image |
|
| mathml |
|
| nav |
|
| remote-resources |
|
| scripted |
|
| svg |
|
|
This property indicates that the deprecated switch element is present. It is only listed for completeness of reporting. |
The following table lists organizations that have stated that they are currently using the spine properties in production.
Spine properties are expressed in the
itemref element's properties attribute.
| Property | Used By |
|---|---|
| page-spread-left |
|
| page-spread-right |
|
The following table lists organizations that have stated that they are currently using the Media Overlays properties in production.
Media Overlays properties are expressed in the
meta element's property attribute.
| Property | Used By |
|---|---|
| active-class |
|
| duration |
|
| narrator |
|
| playback-active-class |
|
Where machine-testable assertions are made about the use of this metadata, conformance is checked by EPUBCheck. In particular, it is able to determine if authors have not set manifest properties correctly.