Missing MDE4UML plug-in org.apache.xerces for Eclipse

Hello,

I have the following problem that I would really appreciate some help with.

Background

1. I have set up Eclipse 3.0.2

2. I downloaded MDE4UML 3.1.3 (namely file mde-studio-eclipse-3.0-plugin-3.1.3.zip) from m1global.org

3. Everything seems to be working ok (although I havent done much work within MDE).

Problem

When I try to obtain or update software using Help > Software Updates > Find and Install > Search for new features to install, and select any new feature, the following error message is detailed

Model-driven Development Environment Studio (3.1.3) requires plug-in "org.apache.xerces".

What is the solution to this problem? I could comment out the following line in the feature.xml file for this plugin

<import plugin="org.apache.xerces"/>

but I'm not sure if it is the right thing to do.

Thanks for the help in advance.