---
title: "Reference"
slug: "dev-dataengine-reference"
tags: ["DataEngine"]
updated: 2026-10-28T02:15:22Z
published: 2026-10-28T02:15:22Z
canonical: "docs.vastdata.com/dev-dataengine-reference"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Reference

Every field, attribute and SDK call, for looking things up while you work. Use Pipeline YAML and Runtime SDK reference most; Events and Function and trigger files cover the rest, and Coming from the Web UI maps UI forms to code.

- **[Pipeline YAML](/develop/docs/dev-dataengine-reference-pipeline-yaml)**: Every field of the pipeline file, what the server fills in, what can't change after creation, and what a deploy requires.
- **[Function and trigger files](/develop/docs/dev-dataengine-reference-function-and-trigger-files)**: Every field of the YAML files that create functions, element triggers and schedule triggers, and how updates and revisions behave.
- **[Runtime SDK reference](/develop/docs/dev-dataengine-reference-runtime-sdk)**: The vast.dataengine.sdk Python API: the init and handler contract, Context, event classes, metrics, tracing, secrets, logging and errors.
- **[Events](/develop/docs/dev-dataengine-reference-events)**: The CloudEvents attributes each element, schedule, function and manual event carries, and the Runtime SDK property that reads each one.
- **[Coming from the Web UI](/develop/docs/dev-dataengine-reference-coming-from-the-ui)**: Map Web UI forms and Visual Builder pipelines to vastde flags and YAML keys, and move a UI-built pipeline into Git.