Explanation

A diagramOnVisual access mode indicates that a publication contains images of diagrams. It is expressed in metadata using the diagramOnVisual value.

As diagramOnVisual describes a characteristic of visual content, it is considered a modifier of the visual access mode value and you should always pair the two values together.

Diagrams are graphics that represent concepts, flow and relationships. Common examples include mind maps, anatomical diagrams, flowcharts, instructions to complete tasks, etc. For graphics that represent concepts, see chartOnVisual.

The diagramOnVisual value is also commonly paired with textOnVisual if the diagram also contains text content necessary to its understanding. (If the diagram is encoded in a format like SVG where the text character data is retained in the markup, however, textOnVisual would not apply.)

It is also not uncommon to pair diagramOnVisual with colorDependent if color perception is the only way to differentiate information (e.g., a flow chart that uses colors to represent different organizational groups).

The diagamOnVisual value would not be specified if the graphic does not carry information necessary to understand the publication, although such cases are rare for diagrams.

A diagramOnVisual access mode is common in publications produced using the EPUB format but is less common for audiobooks. It is only potentially relevant when an audiobook also contains supplementary material beyond the audio.

Examples

<meta property="schema:accessMode">visual</meta>
<meta property="schema:accessMode">diagramOnVisual</meta>

<meta name="schema:accessMode" content="visual"/>
<meta name="schema:accessMode" content="diagramOnVisual"/>

"accessMode": ["auditory", "visual", "diagramOnVisual"]

ONIX Mapping

The diagramOnVisual value maps to list 81 code 19 ("Figures, Diagrams, Charts").

Related Links

• Schema.org — accessMode
• Schema.org Accessibility Vocabulary — diagramOnVisual