To keep your configuration codes of caching separate from business codes, and to maintain loose coupling between the Spring-specific annotations and your source code, XML-based caching configuration is much more elegant than the annotation-based one. So, to configure Spring cache with XML, let's use the cache namespace along with the AOP namespace, because caching is an AOP activity, and it uses the Proxy pattern behind the declarative caching behavior.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-4.3.xsd
...