Modularization and integration of processing

Processing should be divided into modules based on the structural types or domains they support, and can be integrated together into transforms or stylesheets in the same way that structural type and domain modules can be integrated into document types.

• Customization
  When you just need a difference in output, you can use DITA customization to override the default output without affecting portability or interchange, and without involving specialization.
• Modularization in CSS
  Stylesheet support in CSS for DITA specializations can be applied using the same principles as for the DTDs or Schemas, resulting in stylesheets that are easy to maintain and that will support any subsequent specialization with a minimum of effort.
• Modularization in XSLT
  Stylesheet support in XSLT for DITA specializations can be applied using the same principles as for the DTDs or Schemas, resulting in stylesheets that are easy to maintain and that will support any subsequent specialization with a minimum of effort.

OASIS DITA Architectural Specification v1.0 -- 09 May 2005
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