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# Perform a Parametric Search

After you configure IDOL Server to index and recognize parametric fields, you can use the following actions to perform a parametric search.

## GetTagValues

This action allows you to specify one or more parametric fields and return all values that these fields contain in IDOL Server. It includes values in documents that you do not have access to, and values in documents that were deleted (unless you compacted the IDOL Server data index after the documents were deleted).

For example:

    action=GetTagValues&FieldName=Grape

This action requests the different values of the IDOL Server `Grape` fields. It returns a list of all grape varieties stored in an IDOL Server wine database, for example.

You can also restrict the action, so that it returns `Grape` field values only if they are in a document that also contains other specific fields that have specific values. For example:

    action=GetTagValues&FieldName=Grape&Restriction=MATCH{Barossa Valley}:Region+MATCH{Red}:Color

This action returns `Grape` field values only if they are in a document that also contains a `Region` field that has the value Barossa Valley and a `Color` field that has the value Red.

## GetQueryTagValues

This action combines query text with one or more parametric fields. When IDOL Server performs the query, it finds documents that match the specified query text, and returns the values of the specified parametric fields for these documents. Unlike the `GetTagValues` action, the `GetQueryTagValues` action does not return field values in documents that you do not have access to, or in documents that were deleted.

For example:

    http://localhost:5552/action=GetQueryTagValues&FieldName=GRAPE,COUNTRY&Text= A smooth red wine that complements game

This action requests the different values of the `GRAPE` and `COUNTRY` fields of documents that are conceptually similar to the specified `Text`.

You can also restrict the action by combining it with various action parameters. For example:

    http://localhost:5552/action=GetQueryTagValues&FieldName=GRAPE,COUNTRY&Text= A smooth red wine that complements game&MaxValues=10&Sort=Alphabetical

This action requests the 10 top values of the `GRAPE` and `COUNTRY` fields of documents that are conceptually similar to the specified `Text`. IDOL Server displays the values in alphabetical order when it returns them.

    http://localhost:5552/action=GetQueryTagValues&FieldName=GRAPE,COUNTRY&Text= A smooth red wine that complements game&DocumentCount=True

This action requests the different values of the `GRAPE` and `COUNTRY` fields of documents that are conceptually similar to the specified `Text`. The `DocumentCount` parameter instructs IDOL Server to return the number of documents that contain each value.

    http://localhost:5552/action=GetQueryTagValues&FieldName=GRAPE,COUNTRY&Text= A smooth red wine that complements game&FieldDependence=True

This action requests the different values of the `GRAPE` and `COUNTRY` fields of documents that are conceptually similar to the specified `Text`. The `FieldDependence` parameter instructs IDOL Server to find sets of values that occur together. If IDOL Server finds documents that contain the first parametric field listed, it checks if they also contain the subsequently listed parametric fields and returns them. You can also use the `FieldDependenceMultiLevel` parameter to display these results in a hierarchical structure.

For further details on available parameters for the `GetTagValues` and `GetQueryTagValues` actions, refer to the IDOL Server Reference.

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