Explanation

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

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

Charts are graphics that represent data. Common examples include pie charts, bar charts, line graphs, scatter plots, bubble charts, graphs, etc. For graphics that represent concepts, see diagramOnVisual.

It is also common to pair the chartOnVisual value with textOnVisual if the chart also contains text content necessary to its understanding. (If the chart 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 chartOnVisual with colorDependent if color perception is the only way to differentiate information (e.g., a pie chart without a secondary indicator to differentiate each slice).

A chartOnVisual 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">chartOnVisual</meta>

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

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

ONIX Mapping

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

Related Links

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