[rules-users] cannot import function

[xdyl]

HI,all:
   i want import an function in another drools file. but when i use "import
function " in drools 5.3.0.Final
   compile give me a error message:

  Rule Compilation error : [Rule name='start']
	room/Rule_start.java (2:279) : Only a type can be imported.
util.convertString2Set resolves to a package
	room/Rule_start.java (9:629) : The method convertString2Set(String) is
undefined for the type Rule_start

 and i search in google not find any help .
 
 

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