"This article compares and contrasts two different mechanisms for adding context variation to a DITA topic. It's part of a series that describes the 20 plus decisions that face every DITA project. The goal is to identify the pros and cons for each decision and, where warranted, record the known 'best practices' around each decision point. ... Note that strategy choices are typically part of the start-up cost of every project, not just documentation projects. It is therefore worth considering whether a 'Decision Guide' specialization would be useful for DITA." The article contains a tabular comparison of conditionals vs. composition.
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