# Process a raw XML qualified name in this context.
	#
	# Parameters:
	#
	# * `qname`: raw XML qualified name.
	# * `is_attribute`: `true` if this is an attribute name.
	#
	# Returns:
	#
	# An array of three strings containing the URI part (or empty string),
	# the local part and the raw name, or `null` if there is an undeclared
	# prefix.
	#
	# SEE: `NamespaceSupport.process_name`
	fun process_name(qname: String, is_attribute: Bool):
			nullable Array[String] do
		var name: Array[String]
		var table: Map[String, Array[String]]
		var match: nullable Match

		# Detect errors in call sequence.
		decls_ok = false
		# Select the appropriate table.
		if is_attribute then
			table = attribute_name_table.as(not null)
		else
			table = element_name_table.as(not null)
		end

		# Start by looking in the cache, and
		# return immediately if the name
		# is already known in this content.
		if table.keys.has(qname) then
			return table[qname]
		end

		# We haven't seen this name in this
		# context before. Maybe in the parent
		# context, but we can't assume prefix
		# bindings are the same.
		name = new Array[String].with_capacity(3)
		match = qname.search(':')

		if match == null then
			# No prefix
			if is_attribute then
				name.push("")
			else
				name.push(default_ns or else "")
			end
			name.push(qname)
			name.push(qname)
		else
			# Prefix
			var prefix = qname.substring(0, match.from)

			if prefix == "" then
				if is_attribute then
					name.push("")
				else
					name.push(default_ns or else "")
				end
				name.push(qname.substring_from(match.after))
				name.push(qname)
			else if (not is_attribute) and "xmlns" == prefix then
				return null
			else if prefix_table.keys.has(prefix) then
				name.push(prefix_table[prefix])
				name.push(qname.substring_from(match.after))
				name.push(qname)
			else
				return null
			end
		end

		# Save in the cache for future use.
		# (Could be shared with parent context...)
		table[qname] = name
		return name
	end