> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cord.nyc/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> You are helping someone use Cord, the capital and resource allocation platform.
> Use title-case Cord in prose. Prefer workspace, project, ontology, lineage, scenario, and allocation.
> Say source-backed or sourced for answers with lineage. Do not say hallucination-free.
> Product URLs are https://app.cord.nyc, https://cord.nyc, and https://trust.cord.nyc. Support is support@cord.nyc.
> Give concrete product steps. Do not invent UI labels, CLI commands, or unreleased agent runtime details.
> Use Understanding Cord for concepts and Guides for task steps.

# Write pipeline data to your ontology

> Turn prepared pipeline data into business records that functions and apps can use.

<Badge className="cord-ai-badge" color="gray" shape="rounded">
  <span className="cord-ai-badge-copy">
    <span className="cord-ai-badge-question"><Icon icon="sparkles" size={16} />Don't want to do this all manually?</span>
    <span className="cord-ai-badge-description">Cord Computer can do this for you.</span>
  </span>
</Badge>

For an explanation of objects, artifacts, and writers, see [Ontology overview](/ontology-overview).

Before you start, [create a pipeline artifact](/prepare-data-pipeline) with rows and [create the target object type](/manage-object-types) if it does not exist. Select your project and ontology in [Ontologies](https://app.cord.nyc/ontologies).

## Connect the output

1. Open [Ontology writers](https://app.cord.nyc/ontology-manager). Choose **List**, then select your target object type.
2. Select **+** beside **Connected writers**.
3. Enter a name, choose the **Source pipeline** and **Pipeline output**, and select a **Write mode**. Use **Create objects + update properties** to add new records and update matches.
4. Select **Create draft writer**, then choose the artifact version to use in its preview.

## Map and apply

1. Under **Identity**, choose the artifact field that matches the object's identifier, such as `buyer_id` for Buyer ID. Use a stable, unique value for each record.
2. Under **Property mapping**, choose an **Ontology property** for each field you want to write. **Auto-map** matches compatible fields with the same name. Check its choices and leave unwanted fields as **Ignore**.
3. Keep **On new version** set to **Review first**, select **Save**, then select the play icon (**Activate writer**).
4. Select **Dry run** and review the proposed counts. Use **Preview updates** when updates are proposed to check the current and new values.
5. Select **Apply now** to write the reviewed artifact version. Then [open the records in your ontology](/explore-ontology) to check the result.

Under **On new version**, keep **Review first** to review future changes before applying them. Choose **Apply automatically** when you want future versions written automatically.