The font set specification is a list of names (XLFD names or their aliases) and is sometimes called a base name list. All names are separated by commas, with any blank spaces before or after the comma being ignored. Pattern-matching (wildcard) characters can be specified to help shorten XLFD names.
Remember that a font set specification is determined by the locale that is running. For example, the ja_JP Japanese locale defines three fonts (character sets) necessary to display all of its characters; the following identifies the set of Gothic fonts needed.
Example of full XLFD name list:
-dt-mincho-medium-r-normal--14-*-*-m-*-jisx0201.1976-0, -dt-mincho-medium-r-normal--28-*-*-*-m-*-jisx0208.1983-0:
Example of single XLFD pattern name:
-dt-*-medium-*-24-*-m-*:
The preceding two cases can be used with a Japanese locale as long as fonts exist that match the base name list.