This attribute specifies the maximum length to use when writing out
text through the sink function supplied when the StcsChanStcsChan was created.
It is ignored if the IndentIndent attribute is zero (in which case the text
supplied to the sink function can be of any length). The default value
is 70.
The number of characters in each string written out through the sink
function will not usually be greater than the value of this attribute
(but may be less). However, if any single word in the STC-S
description exceeds the specified length, then the word will be
written out as a single line.