Configure Advanced Search in Sharepoint online based on document tags and Rating

I have configured Advanced search to search a document based on document tags and Ratings in Sharepoint online Site. I configured properties based on tags and Ratings using the following reference url. But after searching using tags or ratings, no result is showing.

Reference Url:       http://waelmohamed.wordpress.com/2011/05/31/add-custom-search-properties-in-your-advanced-search-sharepoint-2010/

from point 10, from the above url, added the following in <PropertyDefs>

<PropertyDef Name="Tag" DataType="text"  DisplayName="Tag">

<PropertyDef Name="AverageRating" DataType="decimal"  DisplayName="Rating">



Also added following under <keywordQuery>

<PropertyRef  Name="Tag">

<PropertyRef Name="AverageRating">