SWORD documents use `xmlns:codemeta` as context instead of namespace

Since early versions of the deposit (rDDEPf04c12ed5813676c1eed581ef5594d9a1379365c), xmlns:codemeta="https://doi.org/10.5063/SCHEMA/CODEMETA-2.0" is used, even though the actual Codemeta namespace is https://codemeta.github.io/terms/.

This means that this document:

<?xml version="1.0"?>
    <entry xmlns="http://www.w3.org/2005/Atom"
             xmlns:codemeta="https://doi.org/10.5063/SCHEMA/CODEMETA-2.0">
        <title>Awesome Compiler</title>
        <codemeta:id>1785io25c695</codemeta:id>
        <codemeta:url>origin url</codemeta:url>
    </entry>

Should actually be translated to a JSON-LD document that looks like this:

{
    "@context": [
        "https://doi.org/10.5063/SCHEMA/CODEMETA-2.0",
        {"atom": "http://www.w3.org/2005/Atom#"}
    ],
    "atom:title": "Awesome Compiler",
    "id": "1785io25c695",
    "url": "origin url"
}

(note the added # to the atom namespace, so it is valid JSON-LD; / would have worked too)

Which is equivalent to this in a somewhat expanded form:

  {
    "http://www.w3.org/2005/Atom#title": "Awesome Compiler",
    "@id": "https://json-ld.org/playground/1785io25c695",
    "http://schema.org/url": "https://json-ld.org/playground/origin url"
  }

This is very counter-intuitive, as one would expect XMLNSs to be mapped to JSON-LD compact URIs, like so:

{
    "@context": {
        "codemeta": "https://doi.org/10.5063/SCHEMA/CODEMETA-2.0#",
        "atom": "http://www.w3.org/2005/Atom#"
    },
    "atom:title": "Awesome Compiler",
    "codemeta:id": "1785io25c695",
    "codemeta:url": "origin url"
}

(note the added # as well)

which is equivalent to this:

  {
    "http://www.w3.org/2005/Atom#title": "Awesome Compiler",
    "https://doi.org/10.5063/SCHEMA/CODEMETA-2.0#id": "1785io25c695",
    "https://doi.org/10.5063/SCHEMA/CODEMETA-2.0#url": "origin url"
  }

which is clearly not a codemeta document.

We need to clearly document this pecular behavior, along with the rest of the implied JSON-LD <-> XML translations that are going on in the deposit.

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Migrated from T4393 (view on Phabricator)