ReadMe.txt:

Quick conversion from UniRef xml files to fasta files. The result will be gzipped automatically.

Usage: 
perl unirefxml2fasta.pl uniref90.xml.gz new_uniref90.fasta.gz > convert.log

The output file name is automatically generated if not present.

*note:
There has been a format change for UniRef xml files since 2019_11 (same as other UniProt xml files) where sequence is presented differently. This script relies on the release version (e.g. releaseDate="2020-04-22" version="2020_02") in the xml to automatically handle the version difference. If you run the script on partial xml please make sure it carries said information.