Xml file syntax error: error on line 27628 at column 22: xmlParseEntityRef: no name

This page contains the following errors:
error on line 27628 at column 22: xmlParseEntityRef: no name
Below is a rendering of the page up to the first error.

The error occurs if the xml attribute of an entity has a value with prohibited xml characters, for example:

<param name="Example & Test">Example</param>

The & symbol is used in the name attribute. To avoid the error, it is enough to use htmlspecialchars, for example:

 $yml = '<param name="' . htmlspecialchars($param) . '">';