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5+4+5+4
That really depends on the programming language. In Java, it is sufficient to concatenate it with a String: int myNumber = 5; result = "" + myNumber; Other languages may require a special function, or method, to convert from integer to string.
There was no XML in HTML 4, and you can only add XML to HTML 5 if you reset the content MIME type. XML hasn't changed. But XML is a language used to define other languages. XML was used to define the standards for XHTML 1.0, the successor to HTML 4. The rules of XML apply in XHTML, because the language is based off of XML. These rules are not, in any way, part of HTML 4. HTML 5 is not, by default, an XML based language. But there is a version that allows one to use the XML (or XHTML) style serialization. If you do this, however, you have to deliver the document using an XML MIME type, like application/html+xml. (Normally, this involves messing with the server a bit.) See the related link for HTML 5 Doctor's take on XML serialization in HTML 5, as well as some other, useful links.
html 5 = modern javascript
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