Clarification on extracting texture information from PRC files

Hi folks,
I am trying to read and extract complete texture information from a PRC file (for e.g, texture mapping, texture coordinates, etc.), so that this data can be written to other formats (e.g. OBJ).
While parsing the PRC, we are not able to retrieve the complete texture information correctly. The PRC renders with textures correctly in Acrobat, but when we extract and parse the PRC data, the texture mapping/coordinates are not fully available or clear.
We have also explored how texture data is written in PRC using the available documentation(referred ISO 32000-1:2008, Document management — 3D Use of Product Representation Compact (PRC) Format — Part 1: Version 1), but we are still not able to clearly understand.
Could you please guide us on how texture information (mapping, texture coordinates, etc.) is structured and interpreted in PRC, so that it can be extracted correctly?
Thank you.