Is Jdeveloper hanging on you when use the XPATH expression Builder? Have a look at the Release notes for 11.1.1.2. This will relieve a lot of frustration.

http://download.oracle.com/docs/cd/E15523_01/doc.1111/e14770/bpel.htm#BABECHBF

16.1.6 Oracle JDeveloper May Hang When Using the Expression Builder

Using the Expression Builder to build XPath expressions may cause
Oracle JDeveloper to hang. If that happens, perform the following steps:

1. Kill the Oracle JDeveloper process.

2. Restart Oracle JDeveloper.

3. Select Tools > Preferences > SOA, and deselect the Validate Expression checkbox.

After performing these steps, Oracle JDeveloper should no longer hang.