private void replaceElementPropertyWithValue(Node a) {
        String propertyValue = a.getTextContent();
        String replacedPropertyValue = replaceValue(propertyValue);
        a.setTextContent(replacedPropertyValue);
    }
Handles getting properties from services.xml and replacing references to properties with their real values

@author hmusum
config-application-package/src/main/java/com/yahoo/config/application/PropertiesProcessor.java