Because the branch filtering process can result in new or renamed keys, key scopes, or URIs, the full effects of the branch filtering process MUST be calculated by processors before they construct the effective map and key scope structure.
@keyrefattribute and related attributes are explicitly disallowed on
<ditavalref>. This prevents any confusion resulting from a
@keyrefthat resolves to additional key- or resource-renaming metadata.
In general, the DITA specification refrains from mandating a processing order; thus publication
results can vary slightly depending on the order in which processes are run. With branch
filtering, processors are not required to apply filter conditions specified outside of the map
and filter conditions specified with
<ditavalref> at the same time in a
For example, a processor might use the following processing order:
Because externally-specified "exclude" conditions always take precedence over branch-specific conditions, content excluded based on external conditions will always be removed, regardless of the order in which processors evaluate conditions.
Processors should consider the following points when determining a processing order:
<ditavalref>filter conditions, to ensure that the links are consistent within the modified branches. For example, sequential links based on a map hierarchy should remain within the appropriate modified branch.
<ditavalref>filtering conditions are evaluated, content that applies to multiple audiences can be brought in and (later in the process) selectively filtered by branch. For example, if a set of installation steps is pulled in with conref (from outside the branch), it might contain information that is later filtered by platform based on
<ditavalref>. This results in copies of the steps that are specific to each operating system. If conref is processed after the
<ditavalref>, content might be pulled in that has not been appropriately filtered for the new context.
<ditavalref>conditions allows content for multiple conditions to be pushed and then filtered by branch based on the
<ditavalref>pushes content elsewhere, resolving
<ditavalref>first could result in multiple copies of the content to be pushed (one for each branch), resulting in multiple potentially conflicting copies pushed to the new destination.
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