Graph Builder prepends undesired absolute local path to file variables, and may append undesired file extension when saving. These lines from the graph before opening, and after saving.
source XML: file>${out}_GEO</file
saved XML: file>/gs/some/contract/2016/TEM/cache/snap-benchmark-tmp/${out}_GEO.hdr</file
Graph Builder can remove variables (from Subset):
source XML: geoRegion>${subset}</geoRegion
saved XML: geoRegion/
Graph Builder fails to open some graphs with variable parameters (from S1TBX Terrain-Correction):
standardGridOriginX>${x_origin}</standardGridOriginX
standardGridOriginY>${y_origin}</standardGridOriginY