Standard excerpt:
Attribute sets are used by specifying a use-attribute-sets attribute on xsl:element, xsl:copy or xsl:attribute-set elements.
The value of the use-attribute-sets attribute is a whitespace-separated list of names of attribute sets. Each name is specified
as a QName. Specifying a use-attribute-sets attribute is equivalent to adding xsl:attribute elements for each of the attributes
in each of the named attribute sets to the beginning of the content of the element with the use-attribute-sets attribute,
in the same order in which the names of the attribute sets are specified in the use-attribute-sets attribute.
Examples (xslt:xml):
Interactive xlab: