Resolve topic fragments and code references (topic-fragment)
The topic-fragment step expands content references to elements in the same topic and resolves references made with the coderef element. This step is implemented in SAX pipes.
Content references to elements in the same topic are defined via same-topic fragments such as #./ID in URIs.
The coderef element is used to reference code stored externally in non-XML documents. During the pre-processing step, the referenced content is pulled into the containing codeblock element.
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