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A BlockId is a single line block element containing a unique identifier enclosed in double square brackets. It is used to assign an identifier to the ensuing block element. For example:
[[chapter-titles]] Chapter titles can be ...
The preceding example identifies the ensuing paragraph so it can be
referenced from other locations, for example with
<<chapter-titles,chapter titles>>.
BlockId elements can be applied to Title, Paragraph, List,
DelimitedBlock, Table and BlockMacro elements. The BlockId element
sets the {id} attribute for substitution in the subsequent block’s
markup template. If a second positional argument is supplied it sets
the {reftext} attribute which is used to set the DocBook xreflabel
attribute.
The BlockId element has the same syntax and serves the same function to the anchor inline macro.
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