Data & schema semantics · Validation & constraints

x-maxCombinedLength

`x-maxCombinedLength` appears on schema objects and properties. Its value is a structured object. Used by 15 providers across 15 OpenAPI documents. Consistent with validation & constraints — this is inferred from where the key appears and what it carries, not from any published definition.

Data & schema semantics derived description

How this description was produced. It is assembled from what was measured in the corpus — where this key appears in a document, what shape its value takes, the values observed, and how many providers use it. It is not taken from a published definition, because for most extensions none exists. Read it as evidence, not as a specification. If you own this extension and want it described properly, tell us.

15 occurrences

15 documents

15 providers

purpose-named

Where it appears

Location in the document	Occurrences
schema	15

What its value looks like

Value shape	Occurrences
object	15

Providers publishing it

All 15.

deakin erasmus-university-rotterdam figshare hbku loughborough macquarie stockholm university-of-adelaide university-of-auckland university-of-canterbury university-of-rochester university-of-sheffield university-of-sussex university-of-the-witwatersrand uon

Why this is not in OpenAPI

Extensions exist because a provider needed something the specification would not carry. Most of what they hold is not the API contract at all — it is operational metadata about the contract: documentation, lifecycle, policy, provenance, and now agents. That metadata is usually better placed alongside the contract, in an Overlay or an APIs.json index, than crammed inside it. See everything else doing the data & schema semantics job.