This module provides XSDs for Magento 1 to enable IDE auto-completion and structure validation.

Install this module into your Magento project via composer, then enable it in each of your config xml files.

composer require kirkmadera/magento1-xsds;

Add this to your config.xml files in the root <config> node

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../code/community/KMadera/Magento1Xsds/etc/schema/config.xsd"

Add this to your config.xml files in the root <config> node

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../code/community/KMadera/Magento1Xsds/etc/schema/layout.xsd"

Magento 1 uses custom node names which makes it difficult to write XSDs for. I have not yet found a way to state the structure for all nodes at a certain child level of another node, regardless of the name. This would make XSDs possible for many other config files in Magento 1 like system.xml, adminhtml.xml, widget.xml, etc.

See http://magento.stackexchange.com/questions/111128/how-do-i-specify-structure-of-all-child-elements-of-a-node-in-xsd-where-the-node

I'd like to have a more complete list of XSDs, but are either blocked or have not found the time to sdo so yet.