Nebula Graph for PDF files

[acse-yl2020]

Hello, Nebula community,

I am writing this to ask for your kind opinions and help regarding the following question:
I am currently using Nebula Graph to construct a knowledge graph from multiple PDF files, all related to a specific topic but covering different subtopics. These PDFs have been processed into Markdown (md) files according to my needs. However, it seems necessary to convert these files into CSV format for Nebula, and when I transfer my md files to CSV files, there are plenty of unwanted strings that have been added to the CSV files as there are numerous equations in the original PDF and md files.
As a newbie to Nebula, I have played with the demo dataset, i.e., demo basketball player, simply just age, team, name and year, which does not provide a complex underlying graph relationship.

My questions are:
1. Can Nebula handle data that includes complex equations (not only include equations), and if so, can it build a knowledge graph from such data?
2. If so, What is the best way to convert md files to the required CSV format (e.g., as specified in example.yaml) while avoiding the inclusion of unwanted strings (that will be added to the CSV files when md files are transferred to CSV files)?

Many thanks for your kind help, much appreciated.