I believe I may have joined the site the same day as yourself and therefore I should probably leave this part to the moderators, however I just thought I'd let you know that you will probably recieve considerably more assistance if you follow the forum rules as found here:
XML forum rules: please read
I am making this comment in relation to code sequences being inserted into code tags for easy viewing by the members of the forum.
As for your problem, I have to say that I have not done any work with XML working with Flash, however the XML "code" that you have posted seems incomplete to me - ie: what XML tags are you using for your child elements?
I don't profess to be an expert on this matter as I have only recently learned XML myself, but it seems to me that as per your "code" you have posted, if this is how it actually appears then it is my opinion that your document is not well formed in the sense that your child elements each need an opening and closing line attribute.
<line>Strenuous activities at home or at work</line>
<line>Lifting, carrying, pushing or pulling incorrectly</line>
<line>Standing or bending down for long periods</line>
<line>Twisting or bending awkwardly</line>
<line>Sitting in a hunched position for long periods without taking a break</line>
<line>Muscle tension and or over-stretching</line>
"Each XML element MUST have an opening and closing tag and each element MUST be opened and closed in the correct order for the document to be well formed"
Maybe this is your problem?
I had the same problem as you at one stage whilst writing a document meaning that line breaks are NOT the answer as you are already aware.
Hope I have used the correct terminlogy here and provided some reasonable advice which may assist in solving your problem.
Other respondees: I have no problem with being corrected in regard to any of my statements which prove to be false and/ or the terminology used. I want to learn also.