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# Field-Dependent Cardinal Placement Rules

You can use a cardinal placement rule to insert a document in a results list based on FieldText in the original query. For example, you can insert a value at the top of results when users search for all products in a particular category.

The table shows the fields that you must add to your cardinal placement rule IDX document to include field-dependent rules.

Required IDX fields for field-dependent cardinal placement rules

Field | Description | Content type or value
--- | --- | ---
`#DREREFERENCE` | The reference for the rule. | String
`#DRETITLE` | The title of the rule. | String
`QMSTYPE` | The type of the QMS rule. | `1`
`QMSAGENTBOOL` | The AgentBoolean expression used to match the original query text. | Boolean matching expression
`QMSVALUE1` | The reference of the document to insert. | String
`QMSVALUE2` | The position at which to insert the cardinal placement document in the results. | Number (result position)
`#DRECONTENT` | The content to match the Boolean field. | Keywords from the AgentBoolean string
`QMSFIELDTEXT` | FieldText that the query must contain to match this rule. | FieldText expression.
`Referenced Fields` | All fields that the `QMSFIELDTEXT` field references must be present in the rule as a field with blank content. | Empty field

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