Q:

Escaping XML using Java and Marklogic

I am loading XML into a Marklogic database using Java and Marklogic's XCC API.   Before I do so, I use Apache Commons to escape the elements' contents (StringEscapeUtils.escapeXml).   Upon loading the contents, though, I error out due to a curly brace character in the contents.   escapeXml doesn't handle the curly brace.   My questions are:
1) Is that a Marklogic specific issue (maybe with XCC) or is it an issue with XML in general? 
2) Are there other characters that could also cause a problem (i.e. not escaped by the escapeXml routine)? 
3) Is there a different routine that could be used to avoid this and any future undesired characters? 

A:

You should not escape contents when using XCC, it escapes them itself so you would be doing double-escapes.   However curly brackes are generally not something XML complains about, perhaps you are using the Invoke instead of Insert methods. 
( i.e. then XCC would try to interpret your content as XQuery )
Could you provide a sample of your content and code snippet ? 