Perché mai un post sulla “formattazione” corretta di un documento XML?

Perché alle volte è bene avere presenti questi particolari, soprattutto per non farsi male quando si vanno ad utilizzare parser vari ed eventuali..

Un documento XML si dice well-formed (ed è quindi analizzabile da un parser) se:

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• Non-empty elements are delimited by both a start-tag and an end-tag.

• Empty elements may be marked with an empty-element (self-closing) tag, such as <IAmEmpty />. This is equal to <IAmEmpty></IAmEmpty>.
• All attribute values are quoted with either single (’) or double (”) quotes. Single quotes close a single quote and double quotes close a double quote.
• Tags may be nested but must not overlap. Each non-root element must be completely contained in another element.
• The document complies with its declared character encoding. The encoding may be declared or implied externally, such as in “Content-Type” headers when a document is transported via HTTP, or internally, using explicit markup at the very beginning of the document. When no such declaration exists, a Unicode encoding is assumed, as defined by a Unicode Byte Order Mark before the document’s first character. If the mark does not exist, UTF-8 encoding is assumed.
• Element names are case-sensitive.

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(Tratto da Wikipedia)