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xml:space Space

When printing or displaying the associated element, all white space (such as tabs, ordinary spaces, and line breaks) should be preserved.

Usage/Remarks

Used to keep explicit formatting, for example, in computer code, ASCII art, or poetry. In this Tag Set, the “xml:space” attribute is used with such elements as the <preformat> element, with its value fixed to “preserve”.
FIXED (not settable) on many elements; click for list and usage

<code>, <glyph-data>, <preformat>, <x>

Value Meaning
preserve White space should be preserved. (This value is fixed and cannot be changed in a document.)
Restriction @xml:space has a fixed value which may not be changed in the document.
Tagged Sample

C++ code

...
<code   
  code-type="user interface control" 
  language="C++"
  language-version="11"
  xml:space="preserve" 
  orientation="portrait"
  position="anchor">
 #include &lt;conio.h>
 #include&lt;win_mous.cpp>
 // Needed for mouse &amp; win functions#define
 ...
</code>
...