@format attribute identifies the format of
the resource that is referenced.
If no value is
specified, but the attribute is specified on an ancestor
within a map or within the related-links section, the value
will cascade from the closest ancestor.
The following values for
@format have special processing
@formatis set to "dita", the value for the
@typeattribute will be treated as "topic".
<topicref>element that references a map contains child
<topicref>elements, the processing behavior regarding the child
<topicref>elements is undefined.
@formatattribute is determined by inspecting the value of the
@hrefattribute. If the
@hrefattribute specifies a file extension, the processing default for the
@formatattribute is that extension, after conversion to lower-case and with no leading period. The only exception to this is if the extension is "xml", in which case the default format is "dita". If there is no extension, but the
@hrefvalue is an absolute URI whose scheme is "http" or "https", then the processing default is "html". In all other cases where no extension is available, the processing default is "dita".
actual format of the referenced content differs from the
effective value of the
and a processor is capable of identifying such cases, it
MAY recover gracefully and treat the content
as its actual format, but SHOULD also issue a
For other formats, using the file extension without the "." character
typically represents the format. For example, the following values are
all possible values for
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