def envCheckFilter(self, name, attr):
flt = self._filters.get(name)<EOL>if flt:<EOL><INDENT>return flt.check(attr) <EOL><DEDENT>else:<EOL><INDENT>raise AttributeError("<STR_LIT>" % name)<EOL><DEDENT>
Check if a specific graph attribute is enabled or disabled through 
        the use of a filter based on include_<name> and exclude_<name> 
        environment variables.

        @param name: Name of the Filter.
        @param attr: Name of the Attribute.
        @return:     Return True if the attribute is enabled.