It's what the "ML" stands for in HTML, used for creating Internet documents
In 
this circumstance, create a title from the first few words of the text... [DOC] [TLE] Html - IETF Tools [PAR] Internet-Drafts are draft documents valid for a maximum of six months and may 
be ... Abstract: Until now, many standards was issued to standardize creating and 
... structure of the internet that uses standard (ASCII) domain names untouched; 
... of Unicode characters to compose its domain names and that means the use of
... [DOC] [TLE] Council of Science Editors (CSE) Citation Style - Writing Center [PAR] These parenthetical refer to sources listed at the end of the document.