ghillert/spring-integration — comment on commit 61228cc435040ffe83340c9b0f45a939eda7ba3a
File: spring-integration-xml/src/main/resources/org/springframework/integration/xml/config/spring-integration-xml-2.1.xsd line 450
By olegz:

I would put 'mapping' in quotes since you are referring to a name of the element (sort of an extra emphasis)