Namespaces

The six required namespace prefixes every .dai file declares: bpmn, bpmndi, dc, di, dai, xsi.

Every .dai file declares six namespaces on the root bpmn:definitions element:

<bpmn:definitions
  xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL"
  xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
  xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"
  xmlns:di="http://www.omg.org/spec/DD/20100524/DI"
  xmlns:dai="https://dai.studio/schema/dai/1.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  id="Definitions_1"
  targetNamespace="https://dai.studio/workflow">

The dai: namespace

The dai: namespace carries everything DAI Studio adds on top of standard BPMN. It appears in two places:

Extension attributes — applied directly on BPMN elements using the dai: prefix. Every typed element carries dai:type; every DAI attribute is prefixed, and unprefixed attributes are not part of the format:

<bpmn:task id="Task_1" name="Cite sources" dai:type="dai.types.ai.rule" dai:stepType="rule"
  dai:scope="global" dai:rulePriority="critical" dai:enforcement="hard"
  dai:notes="Every factual claim must be supported by a cited source URL." />

Extension elements — child elements inside bpmn:extensionElements:

<bpmn:extensionElements>
  <dai:workflowMeta description="…" defaultModel="gpt-4o" version="1.0" />
</bpmn:extensionElements>

The dai: extension elements are:

• dai:workflowMeta, with its dai:taskTypeEntry children — diagram-level framing
• dai:fields / dai:field key="…" — type values stored as child elements rather than attributes
• dai:properties / dai:property — typed field and parameter lists

Schema

The dai: vocabulary is declared in a machine-readable XSD served at the namespace URI — https://dai.studio/schema/dai/1.0 — so XML validators and IDEs can locate it automatically. The XSD collects the extension attributes into named attribute groups per BPMN element type and declares every dai: extension element. The per-type vocabulary itself — which keys each type has and where each is stored — is published by the type catalog at https://dai.studio/api/catalog; the XSD only constrains the shared structure (for example, the dai.types.<category>.<leaf> pattern of dai:type).