How can I put an & symbol in an attribute of an XML tag while keeping the XML valid?

XML and HTML are similar, but where is the corresponding canonical Stack Overflow question for HTML? (Many search engine hits end up here.)

Jul 7, 2009 · Learn which characters need escaping in XML documents and how to handle them effectively.

Feb 13, 2014 · XML doesn't have any notion of "reserved characters". It has predefined entities which represent the most of the characters which may (depending on context) have special meaning in an …

Apr 6, 2019 · I have Notepad++ and I got some XML code which is very long. When I pasted it in Notepad++ there was a long line of code (difficult to read and work with). I want to know if there is a …

Learn how to comment out a block of tags in XML effectively with this helpful discussion and tips from Stack Overflow users.

Nov 14, 2019 · I am generating Excel files in C# using OpenXML SDK library. I have noticed that generated content file ([Content_Types].xml) differs from what Excel is generating when saving files. …

Remove invalid characters (restricted + discouraged) in xml document with Java I had some trouble making a pattern from the xml 1.1 specification because it has characters that exceed 16 bits.

I often find this strange CDATA tag in XML files: <![CDATA[some stuff]]> I have observed that this CDATA tag always comes at the beginning, and then followed by some stuff. But sometimes it...

Mar 7, 2017 · XML namespaces enable XML schema authors to differentiate otherwise identical element and attribute names in independently developed schemas. Basing namespace names on URIs …