Aprovechamiento de fragmentos de expresiones use-expression-fragments

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• TL;DR: This page explains how to insert, customize, and manage expression fragments in the personalization editor — including implicit variables, using fragments inside loops, editable fields, dynamic resolution, and breaking inheritance.

Intents:

• Insert an expression fragment from the Fragments menu and understand automatic change propagation
• Use implicit variables: input variables (declared outside the fragment, used inside) and output variables (declared inside the fragment, used in surrounding message content)
• Use expression fragments inside loops — leverage global variables for fragment access; understand the limitation on passing loop-scoped variables as parameters
• Override editable fields in a customizable fragment using <fieldId>="<value>" syntax
• Resolve fragment IDs dynamically at runtime based on profile attributes, dataset lookups, or context data
• Break inheritance by pasting fragment content directly into the editor

Glossary:

• Expression fragment: A reusable personalization expression component referenced by ID across campaigns and journeys; changes to the fragment propagate automatically to all content referencing it. (product-specific)
• Implicit variables: Variables that extend the fragment functionality — input variables (declared in campaign/journey content, consumed inside the fragment) and output variables (declared inside the fragment, available in the surrounding message content). (product-specific)
• Input variable: A variable declared outside the fragment (in campaign or journey content) that the fragment can reference and use internally.
• Output variable: A variable declared or computed inside a fragment that becomes available for use in the surrounding message content after the fragment is called.
• Editable fields: Fragment variables exposed to allow the inserting user to override default values using <fieldId>="<value>" syntax, without editing the fragment source. (product-specific)
• Dynamic fragment resolution: The ability to resolve a fragment ID at runtime (based on profile attributes, dataset lookups, or context data) rather than embedding a static fragment ID at design time. (product-specific)
• Break inheritance: Using “Paste fragment” from the contextual menu copies the fragment’s content into the editor as a standalone element that no longer synchronizes with the original fragment. (product-specific)

Guardrails:

• Maximum 30 fragments can be added in a given delivery.
• Fragments can only be nested up to 1 level.
• A journey or campaign cannot be activated or published if it contains a fragment with Draft status; draft fragments must be approved before publication.
• Expression fragments cannot receive loop-scoped variables (the current {{#each}} iteration item) as parameters — this is a known limitation. Use global variables or inline logic as a workaround.
• If a fragment containing multiple line breaks is used in SMS or push content, line breaks are preserved; test the content before sending.

Terminology:

• Canonical name: expression fragment — variants: fragment, expression fragment
• Synonyms: “fragment ID” = the identifier used to reference the fragment in expressions
• Do not confuse: inserting a fragment by ID (referenced; changes propagate automatically to all content) ≠ breaking inheritance / paste fragment (content copied into editor; standalone element, no longer linked to original)
• Do not confuse: input variables (declared outside the fragment, consumed inside) ≠ output variables (declared inside the fragment, consumed outside in surrounding message content)
• Do not confuse: Draft fragment (can be added to content but blocks journey/campaign publication until approved) ≠ Live fragment (fully published; safe for active journeys and campaigns)

FAQ:

• Q: How many fragments can be added in a single delivery? — Up to 30 fragments.
• Q: Can fragments be nested inside other fragments? — Yes, but only up to 1 level of nesting.
• Q: What happens if I use a Draft fragment in a journey or campaign? — You can add a Draft fragment to content, but you cannot activate or publish the journey or campaign until the fragment is approved and its status changes to Live.
• Q: Can an expression fragment receive the current loop item (e.g., product in {{#each}}) as a parameter? — No. Expression fragments cannot receive loop-scoped variables as parameters. Use global variables declared outside the loop (which the fragment can access), or include the personalization logic directly within the loop instead of using a fragment.
• Q: What is breaking inheritance and when should I use it? — Breaking inheritance means using “Paste fragment” from the contextual menu to copy the fragment’s content directly into the editor. The pasted content becomes a standalone element that no longer synchronizes with the original fragment — use this when you need to customize the content beyond what editable fields allow, knowing future changes to the original fragment will not propagate to this copy.