openapi: 3.1.0
info:
  title: OSIsoft PI Web AssetServers Attributes API
  description: OSIsoft PI Web API (now part of AVEVA) provides a REST interface for accessing the PI System process historian. APIs enable real-time and historical time-series data retrieval, event frame queries, asset framework hierarchy navigation, and calculated data for industrial process monitoring.
  version: 2023.2.0
  contact:
    name: AVEVA Support
    url: https://softwaresupport.aveva.com
  license:
    name: AVEVA Software License
    url: https://www.aveva.com/legal/
servers:
- url: https://{piwebapi_host}/piwebapi
  description: PI Web API server
  variables:
    piwebapi_host:
      default: piwebapi.example.com
      description: PI Web API server hostname
security:
- basicAuth: []
- kerberos: []
tags:
- name: Attributes
  description: AF attribute management
paths:
  /elements/{webId}/attributes:
    get:
      operationId: listAttributes
      summary: List element attributes
      description: Returns attributes of an AF element.
      tags:
      - Attributes
      parameters:
      - $ref: '#/components/parameters/WebId'
      - name: nameFilter
        in: query
        schema:
          type: string
      - name: selectedFields
        in: query
        schema:
          type: string
      responses:
        '200':
          description: Attribute list
          content:
            application/json:
              schema:
                type: object
                properties:
                  Items:
                    type: array
                    items:
                      $ref: '#/components/schemas/Attribute'
components:
  schemas:
    Attribute:
      type: object
      description: A PI AF attribute
      properties:
        WebId:
          type: string
        Id:
          type: string
          format: uuid
        Name:
          type: string
        Description:
          type: string
        Path:
          type: string
        Type:
          type: string
        TypeQualifier:
          type: string
        DataReference:
          type: string
          description: Data reference plugin type (e.g. PI Point)
        ConfigString:
          type: string
          description: Configuration string for data reference
        IsManualDataEntry:
          type: boolean
        HasChildren:
          type: boolean
        EngineeringUnits:
          type: string
  parameters:
    WebId:
      name: webId
      in: path
      required: true
      description: PI Web API WebId (unique opaque identifier for PI System objects)
      schema:
        type: string
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic Authentication
    kerberos:
      type: http
      scheme: negotiate
      description: Kerberos/Windows Integrated Authentication