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S-expression
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== Relation to XML == S-expressions are often compared to [[XML]]: one key difference is that S-expressions have just one form of containment, the dotted pair, while XML tags can contain simple attributes, other tags, or [[CDATA]], each using different syntax. Another is that S-expressions do not define a reference mechanism, whereas XML provides a notion of unique identifiers and references to them. For simple use cases, S-expressions are simpler than XML, but for more advanced use cases, XML has a query language called [[XPath]] which many tools and third party libraries use to simplify the handling of XML data.
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