Expansion Call Unit

Expansion Call Unit

Overview

The Expansion Call Unit is an action unit in the Flow Editor/Designer that allows a flow to invoke extension or expansion services to perform advanced, customizable, or domain-specific operations beyond core system capabilities. This unit is used to call externally defined expansion logic or add-on services that extend the application’s functionality.
  1. What it does:
    1. Takes an input object (like a document, a collection, or a structured dataset).
    2. Expands it into smaller units or elements so that each can be processed individually.
    3. Often used before a For-Each Unit, because once expanded, you can iterate over the individual parts.
  2. How it works:
    1. Input: A complex entity (e.g., a document with multiple sections, a ZIP file with multiple files, or a JSON with nested arrays).
    2. Expansion: Breaks down the entity into its components:
      1. Pages of a document.
      2. Files inside a folder or archive.
      3. Records inside a dataset.
    3. Output: A list or collection of items that can be passed to subsequent steps (like For-Each).
  3. Use case:
    1. Document Processing: Expand a PDF into individual pages for OCR.
    2. Data Pipelines: Expand a JSON array into individual records for transformation.
    3. Batch Operations: Expand a ZIP archive into separate files for upload.
  4. Visual Representation: