This function is used to create an S4 class definition by examining an XML node and mapping the sub-elements to S4 classes. This works very simply with child nodes being mapped to other S4 classes that are defined recursively in the same manner. Consider all options: infographics, videos, podcasts, an interview, a step-by-step guide or even a new tool or template. Remember that longer Thus, you need technical SEO. XML sitemaps are basically roadmaps of all the important pages on your website. .