Membership Checks

At a Glance

This article serves as a reference guide to the Membership Checks category of query language keywords available in schematic and schematic library documents in Altium Designer, showing what each keyword does, how it is written, and example queries for using it in practice. It covers unit conversion keywords such as AsCM, AsDXPs, AsInches, AsMetres, AsMils, and AsMM, along with model and footprint related checks like HasFootprint, HasModel, and HasModelParameter, helping you quickly understand how to target objects and test their properties in query expressions. If you want a clearer path to building and interpreting these specific schematic queries, this page gives you a focused place to start, keep reading and put these keywords to work with confidence.

- Learn what each Membership Checks keyword is used for in schematic and schematic library queries.
- See the syntax and example usage for unit conversion, footprint, model, and model parameter checks.
- Understand when a query must first target a specific object or current model before applying a keyword.
Go Deeper with AI:

The Membership Checks schematic query functions shown in the Query Helper dialog
The Membership Checks schematic query functions shown in the Query Helper dialog

This reference page details the query language keywords from the Membership Checks category available in schematic and schematic library documents in Altium Designer. For help on a specific query keyword, use the following collapsible sections or highlight (or click inside) any given keyword - in the Query Helper, or a Filter panel - and press F1 to access its section right away.

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Contents
Feature Availability

The features available to you depend on which Altium solution you have – Altium Develop, Altium Agile Teams, Altium Agile Enterprise, or Altium Designer (on active term).

If you don’t see a documented feature in your actual software, contact Altium Sales to find out more.

Legacy Documentation

Altium Designer documentation is no longer versioned. If you need to access documentation for older versions of Altium Designer, visit the Legacy Documentation section of the Other Installers page.