Dim dom As XmlDocument = New XmlDocument
dom.LoadXml(xml)
Dim lowTempPath As String = "/rss/channel/item/*[local-name()='forecast']/@low"
Dim lowTemp As String = dom.SelectSingleNode(lowTempPath).InnerText
local-name function:
The local-name function returns the name of the XML element in the local context. Therefore, if an XML element has a namespace prefix, it’s considered to be within that namespace. Using local-name removes the namespace prefix and returns the raw element name.