Used within a custom tag. Finds calling (ancestor) tag by name and accesses its data.

An object that contains data (variables, scopes, and so on) from an ancestor tag. If there is no ancestor by the specified name, or if the ancestor does not expose data (for example, cfif), an exception is thrown.

Other functions

GetBaseTagData(tagname [, instancenumber ] )

GetBaseTagList; "High-level data exchange" in Chapter 11, "Creating and Using Custom CFML Tags," in ColdFusion MX Developer's Guide

<!--- This example shows the use of GetBaseTagData 
function. Typically used in custom tags.--->
...
<cfif trim(inCustomTag) neq "">
      <cfoutput>
         Running in the context of a custom
         tag named #inCustomTag#.<p>
      </cfoutput>
      <!--- Get the tag instance data --->
      <cfset tagData = GetBaseTagData(inCustomTag)>
      <!--- Find the tag's execution mode --->
      Located inside the 
      <cfif tagData.thisTag.executionMode neq 'inactive'>
         template
      <cfelse>
         BODY
      </cfif>