A container element who propagates its own properties to those of type tspan. Might as-well be a simple cdata element featuring text.
AnalyzeText bypasses parseChildren for Tspan elements. Tspan sibling alter the inherited x,y coordinates whenever dx and or dy are defined.
Text can have a cdata text element and tspan elements.
Tspan and text can feature referenced templates <tref/>. This element injects its own cdata text element into its caller.
See also makeText.