Resolve human-readable display values for RESO Data Dictionary enumerated fields using the Lookup resource
domain: reso.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Query the server's $metadata endpoint to identify which fields are typed as enumerations needing lookup resolution
Query the /Lookup resource (rather than relying on the deprecated RESO.OData.Metadata.StandardName annotation) to retrieve display names for every enumerated value
Match returned Lookup records to the raw enum values found on Property/Member/Office records using the LookupValue and LookupKey fields
Cache the Lookup table locally per MLS, since it can contain thousands of values across all standard fields
Refresh the cached Lookup table when the server's Data Dictionary version changes, since enum value sets can be added, renamed, or retired between versions
Known gotchas
The StandardName metadata annotation used before Data Dictionary 1.7 / Web API Core 2.0.0 is deprecated — code relying on it will silently show raw enum codes instead of display names on newer servers
Lookup values are MLS-specific in practice even though the Data Dictionary is a shared standard, so the same field can have different available enum options across MLSs
The full standard Lookup table can exceed 3,600 values; pulling it on every request instead of caching causes unnecessary load and latency
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