# Object sets

An object set represents an unordered collection of objects of a single media type. See [media types](../drag-and-drop-overview/index.md#media-types) and [Palantir media types](../drag-and-drop-overview/index.md#palantir-media-types) for more information.

## Foundry

These are media types primarily used for transporting data in Foundry and are backed by Foundry concepts.

### Foundry object set

**Media type:** `"application/x-vnd.palantir.rid.object-set.temporary-object-set"`

**Data shape:** `string[]`

This media type can be used for transporting Foundry object set RIDs on a DataTransfer. See [object sets (TSv1)](../../functions/api-object-sets/index.md#api-object-sets) for more information.

Refer to the [drag and drop zone tutorial](../tutorial/index.md) for guidance on how to use this media type to implement drag and drop for your application.

#### Usage

This media type can be written to a DataTransfer as follows:

```typescript
const objectSetRids = ["ri.object-set.main.temporary-object-set.XXXXXXXX", "ri.object-set.main.temporary-object-set.YYYYYYYYY"]
event.dataTransfer.setData(
    "application/x-vnd.palantir.rid.object-set.temporary-object-set",
    JSON.stringify(objectSetRids)
);
```

#### Examples

If your Workshop section title is made draggable, it becomes a drag zone that adds the object set media type to the drag payload.

<img src="../../../assets/f0e8cdb5ab5295f14801361836fb4492c1d386590da3eeb1b99b11cf39111bb9.webp" width=600 alt="Foundry Draggable Workshop Section Title">

This drag payload can then be dropped onto a Vertex graph.

<img src="../../../assets/a621ada2a969711f48a6a9e72544aa85a915c8e103822fa759094316a32caf3e.webp" width=600 alt="Foundry Vertex Graph">