How to deal with the problem '<' in OpenERP's view file

In this case,if you write some stirng in your fields which contains '<' , OpenERP will give a error:

Unescaped '<' not allowed in attributes values

you can use '&lt;' instead it.

for more infomation(like why does '>' work properly ) considering this:

http://stackoverflow.com/questions/6322126/whats-the-big-deal-with-using-the-lt-instead-of-simply-to-do-comparison