---
title: Taxonomy
type: tags
order: 426
meta_title: Taxonomy Tag for Hierarchical Labels

meta_description: Customize Label Studio with the Taxonomy tag and use hierarchical labels for machine learning and data science projects.

The Taxonomy tag is used to create one or more hierarchical classifications, storing both choice selections and their ancestors in the results. Use for nested classification tasks with the Choice tag.

You can define nested classifications using the Choice tag, or retrieve external classifications using the apiUrl parameter. For more information on these options, see the Taxonomy template page.

Use with the following data types: audio, image, HTML, paragraphs, text, time series, video.

{% insertmd includes/tags/taxonomy.md %}

Example

Labeling configuration for providing a taxonomy of choices in response to a passage of text

<View>
  <Taxonomy name="media" toName="text">
    <Choice value="Online">
      <Choice value="UGC" />
      <Choice value="Free" />
      <Choice value="Paywall">
        <Choice value="NY Times" />
        <Choice value="The Wall Street Journal" />
      </Choice>
    </Choice>
    <Choice value="Offline" />
  </Taxonomy>
  <Text name="text" value="You'd never believe what he did to the country" />
</View>