When editing the Andorid Mobile WMS configuration file, you MUST enable schema validation for your editor.
This guide explains how to enable schema validation and code completion in Visual Studio or VS-Code.
Overview
Visual Studio
You only have to set one setting, to get get Schema support
Go to: Tools > Options > Text Editor > XML > Miscellaneous
and enable Automatically download DTDs and Shemas
Visual Studio Code
It requires two extensions and a java library downloaded.
Java
Download Java here. Extract the downloaded zip file to e.g. C:\Program Files\Java\jdk-12.0.2
Install and configure Visual Studio Code
Download and install Visual Studio Code (VS Code) here. Install the two extensions "XML" and "Language Support for Java(TM) by Red Hat" in VS Code. Press Ctrl + Shift + X to enter the extensions section, and search in the top.
Configure VS Code
Open the properties json file by pressing Ctrl + Shift + P. Write "Open Settings" and select "Preferences: Open Settings (JSON)".
Add the following lines to the JSON file. Make sure that the java.home property references the location where the java library was extracted to.
As the schema files are downloaded on first use, they may need to be updated from time to time, as more features are added in the configuration. This is done by deleting the existing schema files in the following directory.