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Reference
Variable groups & schema map
Variables of the same kind move the same way. Learn the pattern once per group, and mapping becomes repetition rather than two hundred separate decisions.
Everything you bundle into your XDM - Global variable lands in a predictable place, mostly under _experience.analytics thanks to the Full Extension[4]. The five groups:
OOTB / standard
pageName → web.webPageDetails.name
channel → web.webPageDetails.siteSection
browser, OS → environment.browserDetails.* (auto)
geo → placeContext.geo.* (auto)
eVars → _experience.analytics.customDimensions.eVars.eVarN
props → _experience.analytics.customDimensions.props.propN
list → _experience.analytics.customDimensions.listProps.propN
events → _experience.analytics.event1to100.eventN.value (+ .id to serialize)
products→ productListItems[] (SKU, name, quantity, priceTotal)
For your migration: standard variables auto-map with no processing rules. The one group that fights you is product-scoped merchandising eVars; those are better sent via the data.__adobe.analytics.products string than forced into productListItems[36].