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

# Catalog standards

> Curate the approved vocabulary Atlios uses to check your catalog.

**Catalog standards** are your store's approved vocabulary: the lists of product
types, vendors, tags, option values, and metafields that you consider correct.
When a scan runs, Atlios checks your products against these lists and flags
anything that falls outside them.

Keeping your catalog standards tidy is how you control which differences in your
catalog count as issues and which do not.

## The page

The page opens on whatever needs a decision. If Atlios found something it cannot
settle on its own, that question sits at the top with the values in front of you
and the products that use them. Decisions Atlios has drafted for you sit under
it, and you can apply them all at once.

Under the decision area are your six standards:

* **Vendors**, **Product types**, **Options**, and **Tags:** lists you curate.
* **Metafields:** the custom fields Atlios tracks and checks on your products.
* **Images:** the size, format and background each product's images are held to,
  set by image templates.

A list with something waiting shows how many decisions it holds. Images holds no
decisions, so it shows none. When a list has values in it, it is **Enforced**,
and products outside it are flagged on the next scan.

When nothing needs a decision the page says so.

<Note>
  The header says when Atlios last read your catalog. If that read did not
  finish, the header says how far it got, so an empty page is never mistaken for
  a complete one.
</Note>

## Decide values

Every value Atlios finds and cannot match to your lists becomes a decision. For
each one you can:

* **Approve** it to add it to your approved list.
* **Ignore** it so Atlios stops asking about it.
* **Skip** it to come back to it later.

Where several spellings look like the same thing, Atlios asks which one to keep
and settles the rest in the same step. Approving or ignoring a value changes only
your lists. It never changes your products.

Every decision saves as you make it. There is no save button.

## Vocabulary lists

Each list has a **Show** filter with three slices:

* **In use:** your approved values.
* **To review:** values waiting for a decision.
* **Ignored:** values the scan skips. You can restore any of them.

## Tags

Tags carry two extra kinds of rule, both on the Tags page:

* **Families:** tags that mean the same kind of thing, like `gender_male` and
  `gender_female`. Mark a family exclusive to flag products using more than one.
* **Conditional tags:** suggest a tag only when a related one is present.

Each rule saves on its own as you edit it.

## Metafields

Metafields are the custom fields on your products. Atlios tracks the ones you
choose and checks them during scans. Each tracked metafield has a **scope** of
either **Product** or **Variant**, which controls where it applies.

A metafield that points at another object, such as a metaobject entry, shows
the name of what it points at, never the underlying Shopify id.

See [Manage metafields](/guides/manage-metafields) for how to add, scope, and
stop tracking metafields.

## Metaobjects

Shopify's metaobject types are a read-only directory, under **Integrations**. It
shows each type in your store, its description, and its fields. You create and
change metaobject types in Shopify, under Settings, Custom data.