5eebb559_nd_for_the_PostScript_language__Purpose
[Key] EODCount [Purpose] 
An integer that, in combination with EODString, determines how embedded-PostScript “interruptions” are recognized. Determines how many instances of EODString can be encountered in the input before reading is interrupted; overlapping instances are not multiply counted. If the value is zero, the first occurrence of EODString interrupts reading and is not read as part of the text. If this entry is not present in the dictionary, \markup adds a definition of zero. If EODString is empty, reading will be interrupted when exactly EODCount bytes have been read; this combination is not likely to have practical use in \markup. This value is freshly fetched from the dictionary after any embedded token has been handled, so embedded PostScript tokens may change it.
Markup: a minimalist markup frontend for the PostScript language
Purpose