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# Create Synonym Rules

In all synonym rules, the IDX rule document has the same basic form.

The table shows all the fields that you must include in the IDX file for synonym rules. The value of the `KEYWORDS` and `CONCEPT` fields determines whether the rule is a synonym, hyponym, or hypernym rule.

Required IDX fields for synonym 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. | `4`
`QMSAGENTBOOL` | The AgentBoolean expression used to match the original query text. | Boolean matching expression
`KEYWORDS` | A list of words to match the query text. | Comma-separated list of words. Percent-encode spaces and punctuation in the keywords.
`CONCEPT` | The expanded query text that replaces the matched query text. | Replacement string. Percent-encode spaces and punctuation in the string.
`DATABASERESTRICTION` | The databases to query. | String

To create a synonym rule

- Set the `KEYWORDS` field to a list of all the synonymous terms, and set the `CONCEPT` field to the same list.

  QMS expands any query that matches one keyword to include all the other keyword terms.

To create a hyponym rule

- Set the `KEYWORDS` field to the parent term, and set the `CONCEPT` field to the list of terms that the parent term describes (the hyponyms).

  QMS alters a query that matches the parent term to include all the hyponyms, but not the original term.

To create a hypernym rule

- Set the `KEYWORDS` field to a list of the terms that the hypernym describes, and set the `CONCEPT` field to the parent term (hypernym).

  QMS alters any query that matches one of the list of child terms to query for the hypernym (and not the original term).

Related Topics

- Example Synonym Rules
- Example Hyponym Rule
- Example Hypernym Rule

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