Representation of the IKAT view template, in terms of a condensed in-memory array
of XML "lumps". A lump holds offset and length values into a shared char array
holding the entire template text, as well as various other XML housekeeping
information.
An interface invoked during parsing of a template file, to allow any
last-minute adjustment of attributes (typically, to "auto-mark-up" with
an rsf:id attribute where there may have been none).
The raw constituents of an XML view template, being i) The XMLLump[] array,
ii) The "root lump" holding the initial downmap, and iii) the global headmap.