Note on JDK compatibility with GNU JAXP XPath

Several of the new XPath classes that Chris has contributed cannot be 
compiled with the Sun 1.3 JDK because they use 
java.util.LinkedHashSet, introduced in Java 1.4. The affected classes 
are:

gnu.xml.xpath.Expr
gnu.xml.xpath.Step
gnu.xml.xpath.UnionExpr

I am not aware this project has any specific compatibility objectives 
with Sun, but the project home page does use examples relating to Sun 
1.2 JDK and above in the documentation section.

http://www.gnu.org/software/classpathx/jaxp/jaxp.html

Is it time a policy was adopted on this?

Best regards,

Phil