Use of Managed metadata in Search refinement SharePoint 2010

There are two cases to use managed metadata :

1. Show all managed metadata site columns in search refinement panel:

we should use following xml :
  

< FilterCategories >  

< Category    Title="Managed Metadata Columns"    Description="Managed metadata of the documents"    Type="Microsoft.Office.Server.Search.WebControls.TaxonomyFilterGenerator"    MetadataThreshold="3"    NumberOfFiltersToDisplay="3"    MaxNumberOfFilters="20"    ShowMoreLink="True"    MappedProperty="ows_MetadataFacetInfo"    MoreLinkText="show more"    LessLinkText="show fewer" />  

</ FilterCategories >

This is part of refinement panel xml  by default.

This will show all managed metadata and ordering will be created automatically.

2. . Show a specific managed metadata site columns in search refinement panel : For example we want to add a managed metadata column with name "Test ManagedMetaDataCol"

Check the managed property name of the managed meta data column in central administrator, for this column it is like: owstaxIdTestCPBx0020ManagedMetaDataCol

Remove the "owstaxId" from this and use following as title: TestCPBx0020ManagedMetaDataCol

< FilterCategories > 

< Category    Title="TestCPBx0020ManagedMetaDataCol"    Description="Managed metadata of the documents"    Type="Microsoft.Office.Server.Search.WebControls.TaxonomyFilterGenerator"    MetadataThreshold="3"    NumberOfFiltersToDisplay="3"    MaxNumberOfFilters="20"    ShowMoreLink="True"    MappedProperty="ows_MetadataFacetInfo"    MoreLinkText="show more"    LessLinkText="show fewer" />

</ FilterCategories > 

This will show only the managed metadata column in search refinement panel filter.