---
schema_version: "1"
id: c5c05777209b24e9dfe522dfe3ee8fcdb382f676a88e5b6e81cf1e4bba8b5082
title: Reserved Attributes
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_pb_reserved_attributes.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_pb_reserved_attributes.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 9f30234de1c8be0ce6051312c6e129f03ef1f01a0ab1ca9f4669e05691ca84ad
description: See a list of attributes that are reserved for specific use in Einstein Recommendations. You can’t use these attributes to store other values.
products:
  - Marketing
  - Marketing Cloud Intelligence
release: "264"
---
# Reserved Attributes

See a list of attributes that are reserved for specific use in Einstein Recommendations. You can’t use these attributes to store other values.

 
| Attribute Name | Reserved Use |
| --- | --- |
| ReleaseDate | The first date an item is available for recommendations. This field is required for new arrivals recommendations. The recommended format for this field is YYYY-MM-DD. |
| Rating | The user rating displayed for an item. This field is used to create ratings-based recommendations. |
| NumReviews | The number of reviews an item received. This field is used to create ratings-based recommendations based on items customers are talking about. |
| Keywords | A list of keywords that are used to match attributes to the customer’s interests. |
| Description | A description of an item included in the recommendations. |
| ProductFamily | A field that groups multiple ProductCodes. For example, the ProductFamilyID can include 5 colors of a specific style of t-shirt. These 5 colors are sent in the catalog as 5 unique ProductCodes, with 6 SKU IDs each. |
| Accessories | A list of SKU IDs or ContentIDs defined by the manufacturer or content team, used to create business rules. For example, these products can be excluded from recommendations on the detail pages if they’re already being served to the user on this page. Use a tilde (~) format for this list. |