a9601b6a_PDML_Specification__Description
[Attribute] showdtl (optional) [Description] 
There are some fields that require a more detailed explanation about their value. For instance, a MAC address can be a unicast address (and then we would like to know the vendor of the NIC card) or a multicast /broadcast address. The showdtl is an attribute that specify which description has to be associated to this field in case the standard description (basically the value of the field) is not enough. This attribute is optional because usually a field does not need such a detailed view. This attribute is present only if the corresponding field of the NetPDL description has the showdtl attribute. In this case, this attribute keeps the result of the template specified by the showdtl attribute in the NetPDL description. See the showdtl Section of the NetPDL Visualization Extension for more details.
PDML Specification
Description