a9601b6a_PDML_Specification__Description
[Attribute] showmap (optional) [Description] 
There are some fields whose value can be associated with some meaning. For instance, the field code of an ICMP packet can be associated with the type of ICMP message: Echo Request, Echo Reply, and more. The showmap attribute keeps this kind of association: the value of this attribute will be a literal string that indicates the meaning of this field. This attribute is optional because usually a field does not have such a mapping. This attribute is present only if the corresponding field of the NetPDL description has the showmap attribute. In this case, this attribute keeps the result of the lookup performed by the showmap attribute in the NetPDL description. See the showmap Section of the NetPDL Visualization Extension for more details.
PDML Specification
Description