Ensuring the accessibility and usability of data visualization in government documentation is essential to provide equitable access to information. DITA offers methods to accommodate accessibility and usability requirements for data visualization.

Accessibility Features

DITA allows for the inclusion of accessibility features such as alt text for images, which is particularly important for data visualizations. Here’s an example of how alt text can be added to a chart:

<chart type="bar">
  <data-ref="revenue_data" />
  <alt-text>Bar chart showing revenue by quarter.</alt-text>

In this example, a bar chart references the “revenue_data” source and includes alt text describing the chart’s content, making it accessible to individuals with visual impairments.

Usability Considerations

Usability is crucial for effective data visualization. DITA allows for the integration of usability features, such as providing clear and concise descriptions alongside visualizations. Here’s an example:

<chart type="pie">
  <data-ref="budget_data" />
  <description>A pie chart illustrating budget allocation for different departments.</description>

In this instance, a pie chart referencing “budget_data” is accompanied by a description that enhances usability by providing context and understanding to users.

Interactivity and User Controls

DITA also supports interactivity and user controls for data visualizations. For instance, you can include interactive features like tooltips or the ability to toggle data series on or off. These features enhance user engagement and understanding.

<chart type="line">
  <data-ref="sales_data" />
  <interactive>
    <tooltip />
    <data-series-toggle />
  </interactive>

In this example, a line chart based on “sales_data” incorporates interactive tooltips and data series toggles, allowing users to explore the data in more detail.