文本架构文件 - 需要在标签内允许不同大小的字符串

I am writing a Text Schema browser using a tool that helps me to create fields and all that stuff. I have a portion of an XML file coming in, and everything is a fixed size except for a memo field. I would like to specify an expression that will allow for any length strings terminated by a new XML tag.I am writing a Text Schema browser using a tool