> For the complete documentation index, see [llms.txt](https://atomic-data-sciences.gitbook.io/home/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://atomic-data-sciences.gitbook.io/home/product-guides/data-management/metadata-schemas.md).

# Metadata Schemas

#### Project

{% tabs %}
{% tab title="Attributes" %}
**Name**: a project name entered by the user
{% endtab %}

{% tab title="Contains" %}
**Physical Samples**: instances of Physical Sample associated with the project.
{% endtab %}
{% endtabs %}

#### Physical Sample

{% tabs %}
{% tab title="Attributes" %}
**Name**: a physical sample name entered by the user 

**Notes**: freeform text containing annotations and procedure details 

**Target Material**: an instance of Target Material 

**Growth Instrument**: an instance of Growth Instrument
{% endtab %}

{% tab title="Contains" %}
**Data Items**: instances in the data catalogue corresponding to file artifacts.
{% endtab %}
{% endtabs %}

#### Target Material

{% tabs %}
{% tab title="Attributes" %}
**Name**: a name for the target material entered by the user

**Substrate**: generic string name for the substrate of the target material
{% endtab %}

{% tab title="Contains" %}
**Layers**: ordered list of layers, beginning at the substrate and working up.
{% endtab %}
{% endtabs %}

#### Layer

{% tabs %}
{% tab title="Attributes" %}
**Chemical Formula**: stoichiometric string specifying the composition of the layer.

**Space Group**: 3D space group for the target lattice structure.

**Orientation**: miller indices normal to the film surface.

**Materials Project ID**: identifier for the structure in the materials project
{% endtab %}
{% endtabs %}

<figure><img src="/files/belW26AzNeECczH2RhDp" alt=""><figcaption><p>Cross-section view of the Target Material model.</p></figcaption></figure>

#### Growth Instrument

{% tabs %}
{% tab title="Attributes" %}
**Instrument Label**: user-defined display name for the instrument

**Instrument Name**: name of the instrument make and model

**Instrument Type**: growth technique corresponding to this instrument

**Serial Identifier**: serial number of the instrument
{% endtab %}
{% endtabs %}

Tags

{% tabs %}
{% tab title="Attributes" %}

<table data-view="cards"><thead><tr><th></th><th></th><th></th></tr></thead><tbody><tr><td>Phase</td><td>Monophase, Multiphase, Heterostructure</td><td></td></tr><tr><td>Zone Axis</td><td>10, 01, 11, 12, 21, 22, 13, 31</td><td></td></tr><tr><td>Crystallinity</td><td>Single, Poly</td><td></td></tr><tr><td>Morphology</td><td>Islands, Steps, Layers</td><td></td></tr></tbody></table>

{% endtab %}
{% endtabs %}