# Comment 1
impl1=com.alibaba.dubbo.common.extensionloader.ext1.impl.Ext1Impl1#Hello World
impl2=com.alibaba.dubbo.common.extensionloader.ext1.impl.Ext1Impl2  # Comment 2
   impl3=com.alibaba.dubbo.common.extensionloader.ext1.impl.Ext1Impl3 # with head space