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I would like to add the ORCID to the metadata of documents I write. Is this possible with PDF? Is there a standard way to include it in TeX?

The nicest way would be if there way a standard TeX command so that the compiled PDF would automatically have this information. But if it is possible to add this after the PDF was compiled, it would be nice, too.

The simplest way to add the ORCID to the TeX code is adding a comment

% ORCID of the author: http://orcid.org/0000-0002-6517-1690

But how do other people add their ORCID to papers? Is there a recommendation how to do it, so that scripts / search engines can use the information?

Academicons has TeX package at https://ctan.org/pkg/academicons which is supported by ORCiD. You may also download SVG or PNG icons from ORCiD website, https://orcid.org/trademark-and-id-display-guidelines

1. 
   

   Add following in Document SetUp section of tex file. Second line will define ORCiD recommended color for icon.

   
   
   

   usepackage{academicons}
   
   definecolor{orcidlogocol}{HTML}{A6CE39}
   
   

   
   


2. 
   

   Add following where you like to add ORCiD icon and URL

   
   
   

   item href{https://orcid.org/0000-0000-0000-0000}{textcolor{orcidlogocol}{aiOrcid} hspace{2mm} orcid.org/0000-0000-0000-0000}
   
   

   
   

ORCiD recommends hex: #A6CE39 for icon color. hspace{2mm} is optional, i.e., to give custom space margin between icon and adjacent text.

You can read documentation at https://github.com/diogo-fernan/academicons for details on other icons.

One unresolved issue is to change icon color to ORCiD specified green color and keep it still hyperlinked.

From the linked related answer: Springer picks up ORCID from LaTeX in the following format: Add it as the last line of your address. NOTE: this is in the header, but not wrapped by hypersetup{}

documentclass[11pt]{article}

author{Herr Doktor John Smith}

address{Dept. of Mathematical Sciences \

     University of Awesome\

     Liverpool 56893-3242\

     Albion \ 

     ORCiD: 0000-0004-8882-8330}

email{profSmithRules@awesome.edu}

begin{document}

end{document}

You can use the following template of Springer journals with some additions
where I make hyperlink to the image of ORCID in author.

%%%%%%%%%%%%%%%%%%%%%%% file template.tex %%%%%%%%%%%%%%%%%%%%%%%%%

%

% This is a general template file for the LaTeX package SVJour3

% for Springer journals.          Springer Heidelberg 2010/09/16

%

% Copy it to a new file with a new name and use it as the basis

% for your article. Delete % signs as needed.

%

% This template includes a few options for different layouts and

% content for various journals. Please consult a previous issue of

% your journal as needed.

%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

% First comes an example EPS file -- just ignore it and

% proceed on the documentclass line

% your LaTeX will extract the file if required

begin{filecontents*}{example.eps}

%!PS-Adobe-3.0 EPSF-3.0

%%BoundingBox: 19 19 221 221

%%CreationDate: Mon Sep 29 1997

%%Creator: programmed by hand (JK)

%%EndComments

gsave

newpath

  20 20 moveto

  20 220 lineto

  220 220 lineto

  220 20 lineto

closepath

2 setlinewidth

gsave

  .4 setgray fill

grestore

stroke

grestore

end{filecontents*}

%

RequirePackage{fix-cm}

%

%documentclass{svjour3}                     % onecolumn (standard format)

%documentclass[smallcondensed]{svjour3}     % onecolumn (ditto)

documentclass[smallextended,final,numbook,envcountsect,envcountsame,envcountreset]{svjour3}       % onecolumn (second format)

%documentclass[twocolumn]{svjour3}          % twocolumn

%

smartqed  % flush right qed marks, e.g. at end of proof

%

usepackage{graphicx} %%%% This is very important with image %%%%%

%

usepackage{mathptmx}      % use Times fonts if available on your TeX system

%

% insert here the call for the packages your document requires

%usepackage{latexsym}

% etc.

%%%%%%%%%%%%%%%%%%%%%%%%% My Package %%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%% for hyperlink

RequirePackage[colorlinks,citecolor=blue,urlcolor=blue]{hyperref}

% please place your own definitions here and don't use def but

% newcommand{}{}

%

%%%%%%%%%%%%%%%%%%%% My Commond %%%%%%%%%%%%%

%% for author affod

% Insert the name of "your journal" with

%journalname{name}

%

begin{document}



title{topology%thanks{Grants or other notes

%about the article that should go on the front page should be

%placed here. General acknowledgments should be placed at the end of the article.}

}

%subtitle{Do you have a subtitle?\ If so, write it here}



titlerunning{topology}        % if too long for running head



author{Ali Al-Obaidi href{https://orcid.org/0000-0003-4221-7622}{includegraphics[scale=1]{figures/orcid.jpg}}      and

        Smath Johnhref{https://orcid.org/0000-0002-0000-0000}{includegraphics[scale=1]{figures/orcid.jpg}}}%etc.







authorrunning{Al-Obaidi and John } % if too long for running head



% The correct dates will be entered by the editor





maketitle



begin{abstract}

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA



%keywords{ccccc and cccc and cccccc  and xxxxn and xxxxx and xxxxx}

% PACS{PACS code1 and PACS code2 and more}

%subclass{AAA and AAA and AAAA and AAAand aaaa}

end{abstract}



section{Introduction}

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa



end{document}

Don't forget to download this Color icon (The best choice is iD icon 16x16) from this link
https://orcid.org/trademark-and-id-display-guidelines