I have a block containing some lines representing a device and a number (text) next to it as an index to that device. I insert this block to my drawing. Sometimes I need to change some attributes (XDATA) of that block using an Autolisp routine. However I need to change that number too, say, from no 1 to no 2. How can I search through entities in a block without having to explode it, find the one I want (text) and change it? Is that possible for blocks?