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'''Q: I have a design consisting of a mixture of Verilog 2001 and SystemVerilog input files. Should I parse all the files as SystemVerilog?'''


The set of SystemVerilog constructs is a superset of the set of Verilog 2001 constructs. As a corollary, the set of SystemVerilog keywords is a superset of the set of Verilog 2001 keywords.

Parsing a Verilog 2001 file as SystemVerilog will work, as long as the file does not use any SystemVerilog keyword as identifier. If you parse the file as SystemVerilog an run into a syntax error, try parsing it as Verilog 2001.

Another significant difference between Verilog 2001 and SystemVerilog is "compilation units." The default mode of Verilog 2001 is "multi-file" while the default mode of SystemVerilog is "single-file." For more details, please read:

http://www.verific.com/docs/index.php?title=Single/Multi-File_Compilation_Units