Цитата из w3schools
An XML element is everything from (including) the element's start tag to
(including) the element's end tag.
An element can contain other elements, simple text or a mixture of both.
Elements can also have attributes.
<bookstore>
<book category="CHILDREN">
<title>Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title>Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
In the example above, <bookstore> and <book> have element
contents, because they contain other elements. <author> has
text content because it contains text.
Итак, «текстовое содержание»