XSLT Transformation select parent text without child text.

With a fragement of XML something like this:

How would I select the NAME.XmlText value WITHOUT selecting the NAME.SOUR.XmlText value?

This line in an xslt string produces the output "Ian Lee /SKINNER/@S01891@" Concatenating the NAME.XmlText and NAME.SOUR.XmlText values.

<xsl:value-of select="/gedcom/I001/NAME"/>