xml:space(optional)Allows one to signal to an application whether an element’s white space is
"significant". The behavior of xml:space cascades to all descendant elements, but
be turned off locally by setting the xml:space attribute to the value default.
Allowed values are:
"default" (Allows the application to handle white space as necessary. Not including an
xml:space attribute produces the same result as using the default value.), "preserve" (Instructs the application to maintain white space "as-is", suggesting that it
might have meaning.)