Special fields in composed strings

A composed string (such as used in a composite field, an output file specification or a PDF password) can contain embedded field names enclosed in curly brackets e.g. Dear {name}. The value of the field is substituted at the time of invoking the string e.g. when constructing an output file name. As well as the user-defined fields there are certain special ones:

_{	An opening curly bracket.
_}	A closing curly bracket.
_back	Value is BACK if on a back page or null if not a back page.
_bates	The 'bates' page number as defined in the Configuration\|Layout dialog. Related item: _page.
_bin	The current output bin number. Related item: _tray.
_CR	Carriage Return (character 13 decimal, 0D hex). Related items: _CRLF, _LF.
_CRLF	Carriage Return & Line Feed (0D0A hex). Related items: _CR, _LF.
_day	Today's day number (1-31). Related item: _month.
_DocAuthor	PDF only: the name of person who created the document.
_DocCreationDate	PDF only: the date that the document was created.
_DocCreator	PDF only: the name of the program that created the original document.
_DocKeywords	PDF only: keywords for the document.
_DocProducer	PDF only: the name of the program which output the document.
_DocSubject	PDF only: the subject of the document.
_DocTitle	PDF only: the title of the document.
_DocUpdateDate	PDF only: the most recent update date of document.
_ext	Same as _Iext, see below.
_filename	Same as _Ifilename, see below.
_filenum	The current file number within a list of files being processed.
_filepages	The number of pages in a current input file. Valid only for input formats such as PDF, TIFF or DCX where the number of pages can be easily determined.
_front	Value is FRONT if on a front page, otherwise null.
_GMT	Same as _UTC, see below.
_hour	Time in hours. Related items: _minute, _second.
_id	Unique numeric ID; used to construct the default output file name: {_title}{id}
_Iext	The original (Input) file extension, including the 'dot'. Related item: _Oext.
_Ifilename	The full Input file name. Related item: _Ofilename.
_Iname	The file name stem of the original (Input) file. Related item: _Oname.
_Ipath	The full path of the original (Input) file. Related item: _Opath.
_LF	Line Feed (character 10 decimal, 0D hex). Related items: _CR, _CRLF.
_local	Subsequent times are 'local'; the default time is specified in Universal Coordinated Time.
_minute	Time in minutes. Related items: _hour, _second.
_month	Today's month number (1-12). Related item: _day.
_name	Same as _Iname, see above.
_numpages	When using /FROM to read a CSV Control file, _numpages obtains the number of pages in the current file segment.
_Oext	The Output file extension, including the 'dot'. Related item: _Iext.
_Ofilename	The full Output file name. Related item: _Ifilename.
_Oname	The file name stem of the Output file. Related item: _Iname.
_Opath	The full path of the Output file. Related item: _Ipath.
_orient	The orientation of the page.
_page	The current page number. Related items: _bates, _sheets, _sides.
_paper	The name of the paper used for the page e.g. LETTER
_path	Same as _Ipath, see above.
_PJL_	This is a special construct for extracting data from PJL commands: see PJL note, below.
_RT	This is defined by the value from the @PJL COMMENT REDTITAN DIR value.
_second	Time in seconds. Related items: _minute, _hour.
_sheets	The number of pieces of paper that have been output. Related items: _page, _sides.
_side or _sides	The current side number starting at 1. Related items: _page, _sheets.
_title	The job title; used to construct the default output file name: {_title}{_id}
_tray	The current input tray number. Related item: _bin.
_UTC	Subsequent times are in Universal Coordinated Time. Related item: _local.
_year	Today's year number. Related item: _month.

All these special 'symbols' start with the "underscore" character, followed by characters that may be in upper, lower or mixed case. The underscore characters are to distinguish predefined fields from those defined by the user, but may be omitted if there are no user-defined fields with conflicting names.

Special fields beginning {_PJL_ can be used to extract data from PJL commands. For example,

{_PJL_OUTPAPER}

could be used to search for a command such as

@PJL SET OUTPAPER LETTER

and extract the OUTPAPER parameter (LETTER in this case).

Similarly, the composite field {_PJL_JOB} will yield the name of the job.