[Paraview] [vtm] file formats

[Sören Freudiger]

I cannot find any explizit information about the metafile file format of the
vtm files.
Can anybody help me out?
Expecially for the hieracrchicalboxset format (AMR Block...).

We need to write a multiblock file with different refinement levels. Each
block has an uniform matrix dataset (equal resolution inside each block).
The image data format seems to fit quite well, but makes problems if not
every node of the "whole extend" gets values. Even if these areas are
overlapped by finer blocks. 

Thanks for any help or examples.