When visualizing a metadata category where one or more nodes in the tree have undefined values, these nodes will be visualized using a default value. This value will always be shown in italics in the top of the legend (see the entry "Unknown
" in figure 14.27
). To remove this entry in the legend, all nodes must have a value assigned in the corresponding metadata category.
Figure 14.27: A legend for a metadata category where one or more values are undefined. Fill your metadata table with a value of your choice to edit the mention of "unknown" in the legend.