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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 in the query text. | Comma-separated list of words or phrases.
`CONCEPT` | The expanded query text that replaces the matched query text. | Replacement string.
`DATABASERESTRICTION` | The databases to query. | String

When a query matches the rule, QMS replaces any of the specified `KEYWORDS` that exist in the text with the value in the `CONCEPT` field.

`KEYWORDS` can be a list of individual words or phrases. Separate each word or phrase with a comma. For example:

    #DREFIELD KEYWORDS="Software Development Kit,SDK"

When you use phrases, the entire phrase must match the query text for QMS to apply the rule. For example, software does not match this keyword example.

Note: QMS does not apply synonyms to exact phrase searches. For example, if a user searches for `"software development kit"` (including the quotation marks), QMS does not modify the query.

`CONCEPTS` can be any valid query text string, which QMS inserts into the query text in place of the matching keyword or phrase. For example:

    DREFIELD CONCEPT=""Software Development Kit" OR SDK"

QMS surrounds multiple-word query strings with brackets when it modifies the query. For example, if a user searches for `SDK OR API`, QMS expands the query to (`"Software Development Kit" OR SDK) OR API`.

You can use an appropriate combination of `KEYWORDS` and `CONCEPTS` to create synonym, hyponym, and hypernym rules.

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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