Adjacent feature access methods include: using AttributeManager.

• A. Using a dedicated adjacent attribute access transformer
• B. Using the AttributeManager to reference neighboring features
• C. Manually typing feature[-n].attribute_name
• D. Writing a script outside FME

Answer: (B)

Adjacent feature access is about reading values from features around the current one in the data stream to perform cross-feature calculations. In FME, the AttributeManager provides a built-in way to reference those neighboring features by using the adjacent-feature syntax in attribute expressions (for example, feature[-n].attribute_name). This lets you pull a value from a previous or next feature directly into your current feature’s attributes, enabling comparisons, differences, running totals, and other cross-feature logic without external scripts.

Using the AttributeManager for this purpose is the most practical and standard approach because it integrates cleanly into the FME workflow and leverages the built-in expression capabilities to access neighboring features. Other options either describe an unnecessary separate transformer, involve scripting outside FME, or rely on a manual syntax that isn’t as robust or commonly used as the AttributeManager’s approach.