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Oxygen XML Author allows you to specify syntax highlighting colors for XML elements and attributes with specific namespace prefixes. To configure the Elements/Attributes by Prefix preferences, open the Preferences dialog box (Options > Preferences) and go to Editor > Syntax Highlight > Elements/Attributes by Prefix.

To change the syntax coloring for a specific namespace prefix, choose the prefix from the list, or add a new one using the New button, and use the color and style selectors to set the syntax highlighting style for that namespace prefix.

Note: Syntax highlighting is based on the literal namespace prefix, not the namespace that the prefix is bound to in the document.

If you only want the prefix (and not the whole element or attribute name) to be styled with a particular color, select the Draw only the prefix with a separate color option.