Technically, it is best to use numeric entities (& #1234; ) because they are most compatible (you may not realize it, but named entities need to be defined in the document's DTD, which prevents you from using the same representation in XHTML and, say, plain XML). But in reality I still use named entities, mainly because they are readable in plain text - I mean, if I see & ldquo; I know what it represents, unlike & #8220;
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