#line-number

A built-in variable that provides the number of the line in which an SGML error occurred. (This is the line number in the markup file, as seen by the markup processor.) #line-number can be accessed only from the header and body of sgml-error rules.

If an up-translation or context-translation is being done, the line number is based on the lines of output from find, find-start, find-endand external-text-entity rules sent to the markup processor.

#line-number also can be used as a pattern variable for compatibility with past releases, however, this use is deprecated. Unlike programmer-defined pattern variables, #line-number must always be heralded with the pattern keyword, even where heralding is usually optional.

The is specified test is always true for #line-number because the line number is present in all markup error messages.