Add channel dimension field to paid media dimensional breakdowns schema

[ejsuncy]

Problem

The ACA experience event content schema (experienceevent-content.schema.json) has an xdm:channel field at the root level of xdm:experienceContent that distinguishes between Web, Mobile, and PaidMedia channels. This field is used as a reporting dimension for cross-channel breakdowns in CJA.

The paid media summary metrics schema currently lacks this channel field. When joining web event and mobile event datasets with paid media summary data for an asset ID, there is no field to create the channel dimension for reporting breakdowns.

Proposed Solution

Add xdm:channel to the paid media core identifiers field group (core-paid-media-identifiers.schema.json) under xdm:paidMedia. This is a plain string field matching the experience event schema's channel field.

For paid media rows, the value will always be PaidMedia, but the field needs to exist so that CJA can create a dimension from it for cross-channel reporting.

Reference

• ACA Data Collection Schemas wiki: https://wiki.corp.adobe.com/pages/viewpage.action?spaceKey=scservices&title=ACA+Data+Collection+Schemas
• Jira: https://jira.corp.adobe.com/browse/AN-443653