Make   work in both XML and HTML

HTML has many predefined entities, but XML has only five predefined entities:

• & (& or “ampersand”)
• < (< or “less than”)
• > (> or “greater than”)
• ' (‘ or “apostrophe”)
• " (” or “quotation mark”)

“& #160;” is the decimal form of “& nbsp;” which represents a “Non-Breaking Space” in HTML/XHTML, whilst “& #xA0;” is the hexadecimal form.
“& #160;”  or “& #xA0;” definitely works in both HTML and XML. 

Ref:

• http://changelog.ca/log/2006/06/12/making_nbsp_work_with_xml_rss_and_atom
• http://en.wikipedia.org/wiki/XML#Entity_references

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