Validating

The following fails validation:

<p>The following instructions have been adapted to our configuration from Microsoft's <a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;307311&sd=tech">How To Set Up Internet Connection Sharing in Windows 2000.</a></p>

with this diagnostic.

Warning Line 234 column 158: cannot generate system identifier for general entity "sd".
...om/default.aspx?scid=kb;en-us;307311&sd=tech">How To Set Up Internet Connecti

An entity reference was found in the document, but there is no reference by that name defined. Often this is caused by misspelling the reference name, unencoded ampersands, or by leaving off the trailing semicolon (;). The most common cause of this error is unencoded ampersands in URLs as described by the WDG in "Ampersands in URLs".

Entity references start with an ampersand (&) and end with a semicolon (;). If you want to use a literal ampersand in your document you must encode it as "&amp;" (even inside URLs!). Be careful to end entity references with a semicolon or your entity reference may get interpreted in connection with the following text. Also keep in mind that named entity references are case-sensitive; &Aelig; and &aelig; are different characters.

If this error appears in some markup generated by PHP's session handling code, this article has explanations and solutions to your problem.

Note that in most documents, errors related to entity references will trigger up to 5 separate messages from the Validator. Usually these will all disappear when the original problem is fixed.

Note:

The offending text is in quotes and is part of a valid Microsoft URL.