Hello all,

I have a question about line breaking. I'm working in an environment where text 
going off the page should be avoided at all costs. Even when using hyphenation 
in FOP, it seems like some strings (e.g. only numbers) cannot be broken and 
therefore can go off the page[1]. This seems especially prevalent when using 
table cells. One of the common recommendations seems to be introducing zero 
width spaces into the string. However, I'm more interested in seeing if it's 
possible for FOP to detect this issue automatically and force a line break.

My current understanding of the line breaking algorithm is that each "word" 
will be a single KnuthInlineBox. If hyphenation is enabled and hyphenation 
points are found, it will break this KnuthInlineBox into multiple 
KnuthInlineBoxes that are groups of characters; penalties and glues are then 
placed between each new KnuthInlineBox (representing each hyphenation point). 
I'm wondering how realistic it would be to further break these new 
KnuthInlineBoxes into KnuthInlineBoxes for each character. Then, add glue and 
even higher penalities between these character KnuthInlineBoxes. The goal would 
be to prefer the standard hyphenation points, but have even higher penalty 
places to break just in case. If there are no hyphenation points found, it will 
just break the original KnuthInlineBox into KnuthInlineBoxes for each character.

I have created a simple proof of concept and it "seems" to work.
My question is: how reasonable does this strategy sound? Is there a better way 
to accomplish this that someone could recommend? I suppose it's less efficient 
since multiple objects will be created for each character. Additionally, since 
hyphens could be added anywhere in a string, it could be added somewhere that 
changes the meaning of the string. I consider that a reasonable alternative to 
text going off the screen though.


[1] Here is an example where the string of characters will go off of the page 
since it is only numbers:
<?xml version="1.0" encoding="UTF-8"?><fo:root 
language="en"><fo:layout-master-set><fo:simple-page-master master-name="all" 
page-width="8.5in" page-height="11in" margin-left="1in" margin-right="1in" 
 master-reference="all"><fo:flow flow-name="xsl-region-body"><fo:block 

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