enum is used as the variable name

[Yong Hu]

In some code, enum is used as the variable name, but it is the reserved word in 
JDK1.5. So, compile error happens when using jdk1.5 compile the code.
 
Currently, I find the files with 'enum'
org.apache.slide.structure.StructureImpl.java and 
org.apache.slide.security.SecurityImpl.java

                
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