---
title: Web services standards
description: The PingFederate WS-Trust security token service (STS) interoperates with many different web-service environments that support varying standards.
component: pingfederate
version: 13.1
page_id: pingfederate:introduction_to_pingfederate:pf_web_service_standard
canonical_url: https://docs.pingidentity.com/pingfederate/13.1/introduction_to_pingfederate/pf_web_service_standard.html
llms_txt: https://docs.pingidentity.com/pingfederate/llms.txt
docs_for_agents: https://developer.pingidentity.com/build-with-ai/docs-for-agents.md
revdate: July 5, 2022
---

# Web services standards

The PingFederate WS-Trust security token service (STS) interoperates with many different web-service environments that support varying standards.

PingFederate supports multiple versions of SOAP and WS-Trust specifications and operates with any combination of these standards simultaneously.

PingFederate supports namespace aliasing to eliminate common trailing-slash inconsistencies for WS-Trust 1.3. The server does not support namespace aliasing for WS-Trust 2005.

The following table lists supported SOAP/WS-Trust versions and corresponding namespaces.

**SOAP/WS-Trust versions**

| Spec     | Version | Namespace                                            |
| -------- | ------- | ---------------------------------------------------- |
| SOAP     | 1.1     | <https://schemas.xmlsoap.org/soap/envelope/>         |
|          | 1.2     | <https://www.w3.org/2003/05/soap-envelope/>          |
| WS-Trust | 2005    | <https://schemas.xmlsoap.org/ws/2005/02/trust/>      |
|          | 1.3     | <https://docs.oasis-open.org/ws-sx/ws-trust/200512/> |