Use the following syntax to specify the captionTruncate attribute:
captionTruncate="enumeration"
where enumeration is one of: word | character
If you use the character value, the caption is cut off whenever the maximum caption length is reached, even if this occurs in the middle of a word. If you use the word value, the caption is cut off at the end of a word. The maximum caption length depends on the width of the object and the font size.
When a caption has been truncated, the application places an asterisk at the right end of the caption to indicate that text is missing.