<p>Filter is implicitly passed route, and it can access its attributes, just like it accesses variables.
-<desc>
+<descrip>
<tag>defined( <m>attribute</m></tag>
returns TRUE if given attribute is defined. Access to undefined attribute results in runtime error.
<tag/enum source/
what protocol told me about this route. This can have values such as <cf/RTS_RIP/ or <cf/RTS_OSPF_EXT/.
-</desc>
+</descrip>
<p>Plus, there are protocol-specific attributes, which are described in protocol sections.