The DTD is added to the first record of each metadata file sent to the National Agricultural Library.
?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ArticleSet PUBLIC "-//NLM//DTD PubMed 2.6//EN" "http://www.ncbi.nlm.nih.gov/corehtml/query/static/PubMed.dtd">
The journal title should be transcribed as it appears on the journal. Do not use the abbreviated form the title.