Solr configuration file

[bhaskar chandrasekar]

Hi,
 
In my Solrconfig file, can any one let me know what the below does 
 
str name="qf" and st name="mm" represents?.
in the below mentioned.
 
<requestHandler name="partitioned" class="solr.SearchHandler" >
    <lst name="defaults">
     <str name="defType">dismax</str>
     <str name="echoParams">explicit</str>
     <str name="qf">text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0</str>
     <str name="mm">2&lt;-1 5&lt;-2 6&lt;90%</str>
     <str name="bq">incubationdate_dt:[* TO NOW/DAY-1MONTH]^2.2</str>
    </lst>
 
ex:text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0.What ^ and numeric part 
represents?.
Does it have any thing to do with ranking of web pages?.
 
Regards
Bhaskar