# xsl:copy-of

The `xsl:copy-of` element copies of the value of the expression in the mandatory `select` attribute to the result tree

If this expression is a string, a number, or a boolean, the effect is the same as using `xsl:sequence`.

There is an optional attribute `copy-namespaces` whose value is "yes" or "no". The default is "yes". This controls whether the in-scope namespaces of any element nodes copied by this instruction are automatically copied to the result tree. If the value is "no", then namespaces will only be copied if they are actually used in the names of elements or attributes. This allows you, for example, to copy the contents of a SOAP message without copying the namespaces declared in its envelope.

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