I have noticed within several maven example
project.xml files under the <dependency> elements
differences in syntax.  What is the difference between
the "+" and "-" characters when seperating words.  For
instance:

  <dependencies>
    <dependency>
        <id>commons-collections</id>
        <version>2.1</version>
    </dependency>
    <dependency>
        <id>xdoclet+ejb-module</id>
        <version>1.2b2</version>
    </dependency>
  </dependencies>

For "<id>xdoclet+ejb-module</id>", I cannot find any
file by that name, although I have found
"xdoclet-ejb-module-1.2b2.jar", and so I figure that
"+" must be some type of special character.  If yes,
then what does it mean?  Also, does the "-" hold any
significance?  Are there any more special charaters or
syntax that may be utilized within those elements? 
Where is the documentation for this stuff?  I cannot
find anything referencing it at maven.apache.org.

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