DITA Bootstrap v6

[jason-fox]

The v6 branch updates the PDF customization plugin (which renders DITA content to PDF using XSL-FO) to match the Bootstrap 6 styling specs, particularly color system upgrades and component rendering.

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1. Color Palette Variable Updates

Bootstrap 6 changes color mappings (replacing light / dark with accent / inverse). The PDF attributes and settings files have been updated to reflect these values:

• Removed Variables: Legacy variables like bootstrap-light, bootstrap-dark, bootstrap-light-subtle, bootstrap-dark-subtle, and their table/button/badge sub-variants.
• Added Variables:
  • bootstrap-accent / bootstrap-inverse
  • bootstrap-accent-subtle / bootstrap-inverse-subtle (along with their text colors: *-subtle-text)
  • Component-specific variables for tables, buttons, and badges matching accent and inverse.
• Color Code Alignments: Updated color hex codes across all default variables to match Bootstrap 6 design tokens (e.g. bootstrap-btn-primary-bg changed from #0d6efd to #0087fe).

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2. Component Element Matching & Specialization Support

PDF templates were updated to directly check the DITA element names (like self::card or self::drawer) rather than solely relying on class hierarchy matching. This yields cleaner code and better compatibility with DITA 2.0 and custom maps.

• Cards): cards.xsl
  • Updated element matching to support self::card, self::card-header, and self::card-footer.
  • Added a custom bootstrapDecoration mode override template for cards to prevent background color duplication on card borders and bodies.
• Alerts alert.xsl
  • Added support for theme- prefixed outputclasses (e.g., theme-success) which are used in Bootstrap 6 alongside alert- styling classes.
  • Added exclusions in the template match statement to prevent other block elements (like drawer, carousel, or accordion) from being processed as alerts.
• Drawers & Notes ([drawer.xsl/offcanvas.xsl updates]):
  • Standardized drawer element support to mirror the HTML output structure changes.