# FieldCheck Parameter

You can use the `FieldCheck` action parameter to return only documents whose `FieldCheckType` field matches the value you specify, for example a category name. You must identify a `FieldCheckType` field before you store content in the IDOL Content component.

If you set `UrlAnalysis` to `True` in the IDOL Content component configuration file, enter a domain name for `FieldCheck` to restrict results to documents that were aggregated from this domain. For example:

    http://IDOLhost:port/action=Query&Text=A fast sports car&FieldCheck=Red

In this example, Content is configured to store the `Color` field as a `FieldCheckType` field. The query returns only those results whose content matches the specified `Text` and whose `FieldCheckType` field has the value `Red`.

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