Intrinsic attributes are simple attributes that are created automatically from: AsciiDoc document header parameters; asciidoc(1) command-line arguments; attributes defined in the default configuration files; the execution context. Here’s the list of predefined intrinsic attributes:

{amp}                 ampersand (&) character entity
{asciidoc-dir}        the asciidoc(1) application directory
{asciidoc-file}       the full path name of the asciidoc(1) script
{asciidoc-version}    the version of asciidoc(1)
{author}              author's full name
{authored}            empty string '' if {author} or {email} defined,
{authorinitials}      author initials (from document header)
{backend-<backend>}   empty string ''
{<backend>-<doctype>} empty string ''
{backend}             document backend specified by `-b` option
{backslash}           backslash character
{basebackend-<base>}  empty string ''
{basebackend}         html or docbook
{brvbar}              broken vertical bar (|) character
{revdate}             document revision date (from document header)
{docdate}             document last modified date
{doctime}             document last modified time
{docname}             document file name without extension
{docfile}             document file name  (note 5)
{docdir}              document input directory name  (note 5)
{doctitle}            document title (from document header)
{doctype-<doctype>}   empty string ''
{doctype}             document type specified by `-d` option
{email}               author's email address (from document header)
{empty}               empty string ''
{encoding}            specifies input and output encoding
{filetype-<fileext>}  empty string ''
{filetype}            output file name file extension
{firstname}           author first name (from document header)
{gt}                  greater than (>) character entity
{id}                  running block id generated by BlockId elements
{indir}               input file directory name (note 2,5)
{infile}              input file name (note 2,5)
{lastname}            author last name (from document header)
{level}               title level 1..4 (in section titles)
{listindex}           the list index (1..) of the most recent list item
{localdate}           the current date
{localtime}           the current time
{lt}                  less than (<) character entity
{manname}             manpage name (defined in NAME section)
{manpurpose}          manpage (defined in NAME section)
{mantitle}            document title minus the manpage volume number
{manvolnum}           manpage volume number (1..8) (from document header)
{middlename}          author middle name (from document header)
{nbsp}                non-breaking space character entity
{notitle}             do not display the document title
{outdir}              document output directory name (note 2)
{outfile}             output file name (note 2)
{reftext}             running block xreflabel generated by BlockId elements
{revnumber}           document revision number (from document header)
{sectnum}             formatted section number (in section titles)
{showcomments}        send comment lines to the output
{title}               section title (in titled elements)
{two-colons}          Two colon characters
{two-semicolons}      Two semicolon characters
{user-dir}            the ~/.asciidoc directory (if it exists)
{verbose}             defined as '' if --verbose command option specified
{zwsp}                Zero-width space character entity