public abstract java.lang.String getSpecificationVersion()
Return the version number of the JSP specification that is supported by
this JSP engine.
Specification version numbers that consists of positive decimal integers
separated by periods ".", for example, "2.0" or "220.127.116.11.5.6.7".
This allows an extensible number to be used to
represent major, minor, micro, etc versions.
The version number must begin with a number.
the specification version, null is returned if it is not known