# Retrieve a selection by pool and definition

Retrieves selection items for a given selection pool.
At least one of the following must be provided. If both are provided, the route parameter takes precedence:
- `definitionName` (route parameter) - single definition name.
- `definitionNames` (query parameter) - comma-separated list of definition names; for example, `GET /api/selection/AssetSelectionPool?definitionNames=M.Asset,M.Content`.

Endpoint: GET /api/selection/{selectionPool}/{definitionName}
Version: v1.0
Security: OAuth2.0

## Security:

  - `OAuth2.0` (unknown)
    oauth2

## Path parameters:

  - `selectionPool` (string, required)
    Selection pool identifier

  - `definitionName` (string, required)
    Single definition name

## Query parameters:

  - `definitionNames` (string)
    Comma-separated list of definition names

  - `subPoolId` (integer)
    Optional sub-pool identifier for scoped selections

  - `ignorePermissions` (boolean)
    Skip permission calculation for faster response

## Header parameters:

  - `If-Modified-Since` (string)
    Conditional request support (not currently implemented)

## Response 200:

  - `200` (unknown)
    Selection retrieved successfully

## Response 400:

  - `400` (unknown)
    No definition name provided (either route or query parameter)

## Response 404:

  - `404` (unknown)
    Selection pool identifier not found

## Response 200 examples:

  - `Single definition` (unknown)

  - `Multiple definitions` (unknown)