XML tags are merely data descriptions; they carry no formatting instructions. As such, you need to format XML content after you import it and lay it out. One way to do that is to map XML tags to paragraph, character, table, or cell styles. For example, the Byline tag could be mapped to the Author character style, so that all imported and placed XML content that is tagged Byline is automatically assigned the Author character style. Mapping tags to styles makes formatting imported XML content easier and less time-consuming.
You don’t need to map every tag to a paragraph or character style. Some elements may not appear in the layout and others may be easier to format one at a time. Moreover, child elements take on the paragraph or character style that is assigned to their parent, which can cause confusion unless you are careful to map parent and child elements separately.