Version 0.5.1
Documentation on Parse MEDLINE XML in README differs a bit from the medline_parser script.

Readme: delete : boolean if False means paper got updated so you might have two
Script: An iterator of dictionary containing information about articles in NLM format.
see parse_article_info). Articles that have been deleted will be
added with no information other than the field delete being True

I'm somewhat confused. As one seems to indicate that delete = False -> paper updated
While delete = True -> paper deleted.
But these don't seem like natural opposites. Doesn't updated mean that the previous paper was deleted?

Readme for reference:
MEDLINE XML has a different XML format than PubMed Open Access. The structure of XML files can be found in MEDLINE/PubMed DTD [here](https://www.nlm.nih.gov/databases/dtd/). You can use the function parse_medline_xml` to parse that format. This function will return list of dictionaries, where each element contains:

• pmid : PubMed ID
• pmc : PubMed Central ID
• doi : DOI
• other_id : Other IDs found, each separated by ;
• title : title of the article
• abstract : abstract of the article
• authors : authors, each separated by ;
• mesh_terms : list of MeSH terms with corresponding MeSH ID, each separated by ; e.g. 'D000161:Acoustic Stimulation; D000328:Adult; ...
• publication_types : list of publication type list each separated by ; e.g. 'D016428:Journal Article'
• keywords : list of keywords, each separated by ;
• chemical_list : list of chemical terms, each separated by ;
• pubdate : Publication date. Defaults to year information only.
• journal : journal of the given paper
• medline_ta : this is abbreviation of the journal name
• nlm_unique_id : NLM unique identification
• issn_linking : ISSN linkage, typically use to link with Web of Science dataset
• country : Country extracted from journal information field
• reference : string of PMID each separated by ; or list of references made to the article
• delete : boolean if False means paper got updated so you might have two
• languages : list of languages, separated by ;
• vernacular_title: vernacular title. Defaults to empty string whenever non-available.

XMLs for the same paper. You can delete the record of deleted paper because it got updated.`

Greatful for clarification as I've hade some duplication issues