First commit.

alter_mods_template.info.yml

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+name: Alter Mods Template (PWC)
+description: "Alters the MODS template for OAI-PMH"
+package: Custom
+type: module
+core_version_requirement: ^10.3 || ^11

alter_mods_template.module

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+<?php
+
+function alter_mods_template_rest_oai_pmh_metadata_template_alter(array &$template) {
+  // Use my module's template file to render mods metadata.
+  if ($template['file'] == 'mods') {
+    // This would use the template path/to/mymodule/templates/mods.html.twig
+    // for mods metadata rendered in OAI-PMH.
+    $template['name'] = 'alter_mods_template';
+  }
+}
+
+function alter_mods_template_theme($existing, $type, $theme, $path) {
+  return [
+	  'paragraph__contributor__data' => [],
+	  'field__field_contributor_name_and_role__data' => [],
+	  'field__field_contributor_description__data' => [],
+  ];
+}
+
+function alter_mods_template_theme_suggestions_field(array $variables) {
+	$suggestions = [];
+	$field = $variables['element']['#field_name'];
+	$view_mode = $variables['element']['#view_mode'];
+	$suggestions[] = 'field__' . $field . '__' . $view_mode;
+	if ($variables['element']['#view_mode'] == 'data') {
+	#	dump($variables);
+	}
+	return $suggestions;
+}

templates/field--field-contributor-description--data.html.twig

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+{{ element }}

templates/field--field-contributor-name-and-role--data.html.twig

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+{{ element[0]['#prefix'] | trim | lower }}{{ element[0]['#entity'].bundle }}:{{ element[0]['#plain_text'] }}

templates/mods.html.twig

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+
+
+<titleInfo>
+  <title lang="eng">{{ elements.title }}</title>
+{% if elements.subtitle is not empty%}    <subTitle>{{ elements.subtitle }}</subTitle>{% endif %}
+</titleInfo>
+{% for name_info in elements.names | split ('|') %}
+{% set name_info = name_info | split(':', 3) %}
+{% set name__role = name_info[0] | trim | lower %}
+{% set name__type = name_info[1] | replace({"corporate_body":"corporate"}) | raw %}
+{% set name_info = name_info[2] | split("~", 2) %}
+{% set name__name = name_info[0] | trim %}
+{% set name__description = name_info[1] | trim %}
+{% if name__name is not empty %}
+<name type="{{ name__type }}">
+  <namePart>{{ name__name }}</namePart>
+  <role>
+    <roleTerm authority="marcrelator" type="text">{{ name__role }}</roleTerm>
+  </role>
+{% if name__description is not empty %}
+  <description>{{ name__description }}</description>
+{% endif %}
+</name>
+{% endif %}
+{% endfor %}
+{% if elements.typeofresource is not empty %}<typeOfResource>{{ elements.typeofresource }}</typeOfResource>
+{% endif %}
+{% if elements.genre is not empty %}<genre>{{ elements.genre }}</genre>
+{% endif %}
+{% if elements.abstract is not empty %}<abstract>{{ elements.abstract }}</abstract>
+{% endif %}
+{% if elements.language_iso6392b is not empty %}
+{% for language in elements.language_iso6392b | split ('|') %}
+<language>
+  <languageTerm authority="iso639-2b" type="code">{{ language | trim }}</languageTerm>
+</language>
+{% endfor %}
+{% endif %}
+<originInfo>
+{% if elements.publisher is not empty %}  <publisher>{{ elements.publisher }}</publisher>
+{% endif %}
+{% if elements.published_place is not empty %}
+  <place>
+    <placeTerm type="text">{{ elements.published_place }}</placeTerm>
+  </place>
+{% endif %}{% if elements.published_place_marccountry is not empty %}  <place>
+    <placeTerm authority="marccountry">{{ elements.published_place_marccountry }}</placeTerm>
+  </place>
+{% endif %}
+{% if elements.dateissued_edtf is not empty %}  <dateIssued encoding="edtf">{{ elements.dateissued_edtf }}</dateIssued>
+{% endif %}
+{% if elements.datecreated_edtf is not empty %}  <dateCreated encoding="edtf">{{ elements.datecreated_edtf }}</dateCreated>
+{% endif %}
+{% if elements.datecopyright_edtf is not empty %}  <copyrightDate>{{ elements.datecopyright_edtf}}</copyrightDate>
+{% endif %}</originInfo>
+<physicalDescription>
+{% if elements.physicaldescription_form is not empty %}  <form>{{ elements.physicaldescription_form }}</form>
+{% endif %}
+{% if elements.physicaldescription_extent is not empty %}  <extent>{{ elements.physicaldescription_extent }}</extent>
+{% endif %}
+{% if elements.physicaldescription_note is not empty %}  <note>{{ elements.physicaldescription_note }}</note>
+{% endif %}
+</physicalDescription>
+{% for topic in elements.subject_topic |split ('|') %}
+<subject>
+  <topic>{{ topic|trim }}</topic>
+</subject>
+{% endfor %}
+{% for geographic in elements.subject_geographic |split ('|') %}
+<subject>
+  <geographic>{{ geographic|trim }}</geographic>
+</subject>
+{% endfor %}
+{% for temporal in elements.subject_temporal |split ('|') %}
+<subject>
+  <temporal>{{ temporal|trim }}</temporal>
+</subject>
+{% endfor %}
+{% if elements.subjects_name is not empty %}  
+{% set name_type_info = elements.subjects_name_vocabulary|split('|') %}
+{% for subject_name_info in elements.subjects_name |split ('|') %}
+{% set name_type_info_x = name_type_info[loop.index0] | replace({"Person":"person", "Corporate Body":"corporate", "Family":"family", "Conference":"conference"}) | raw %}
+<subject>
+  <name type="{{ name_type_info_x }}">
+    <namePart>{{ subject_name_info }}</namePart>
+  </name>
+</subject>
+{% endfor %}
+{% endif %}
+<subject>
+  <hierarchicalGeographic>
+    <continent>{{ elements.subject_hierarchicalgeographic_continent }}</continent>
+    <country>{{ elements.subject_hierarchicalgeographic_country }}</country>
+    <state>{{ elements.subject_hierarchicalgeographic_state }}</state>
+    <province>{{ elements.subject_hierarchicalgeographic_province }}</province>
+    <region>{{ elements.subject_hierarchicalgeographic_region }}</region>
+    <county>{{ elements.subject_hierarchicalgeographic_county }}</county>
+    <island>{{ elements.subject_hierarchicalgeographic_island }}</island>
+    <city>{{ elements.subject_hierarchicalgeographic_city }}</city>
+    <citySection>{{ elements.subject_hierarchicalgeographic_citysection }}</citySection>
+  </hierarchicalGeographic>
+</subject>
+<subject>
+  <cartographics>
+    <coordinates>{{ elements.subject_geographic_coordinates }}</coordinates>
+  </cartographics>
+</subject>
+{% if elements.relateditem_title is not empty %}
+  <relatedItem type="host">
+    <titleInfo>
+      <title>{{ elements.relateditem_title }}</title>
+    </titleInfo>
+  </relatedItem>
+{% endif %}
+{% if elements.relateditem_collection_title is not empty %}
+  <relatedItem type="collection">
+    <titleInfo>
+      <title>{{ elements.relateditem_collection_title }}</title>
+    </titleInfo>
+  </relatedItem>
+{% endif %}
+{% if elements.accesscondition_restrictiononaccess is not empty%}
+  <accessCondition type="restriction on access">{{ elements.accesscondition_restrictiononaccess }}</accessCondition>
+{% endif %}
+<accessCondition type="use and reproduction">{{ elements.accesscondition_useandreproduction }}</accessCondition>
+<location>
+  <url usage="primary display">{{ elements.location_url }}</url>
+  {% if elements.location_physical is not empty %}
+    <physicalLocation>{{ elements.location_physical }}</physicalLocation>
+  {% endif %}
+</location>
+<identifier type="uri">{{ elements.identifier_uri}}</identifier>
+<identifier type="local">{{ elements.identifier_local}}</identifier>
+<identifier type="ark">{{ elements.identifier_ark}}</identifier>
+<note>{{ elements.note }}</note>
+<recordInfo>
+  {% if elements.recordinfo_note_coursecode is not empty %}
+  <recordInfoNote type="courseCode">{{ elements.recordinfo_note_coursecode }}</recordInfoNote>
+  {% endif %}
+  {% if elements.recordinfo_note_courseyear is not empty %}
+    <recordInfoNote type="courseYear">{{ elements.recordinfo_note_courseyear }}</recordInfoNote>
+  {% endif %}
+  {% if elements.recordinfo_note_courseterm is not empty %}
+    <recordInfoNote type="courseTerm">{{ elements.recordinfo_note_courseterm }}</recordInfoNote>
+  {% endif %}
+  <languageOfCataloging>
+  {% if elements.recordinfo_cataloguing_language_iso6392b is not empty %}
+    <languageTerm authority="iso639-2b" type="code">{{ elements.recordinfo_cataloguing_language_iso6392b }}</languageTerm>
+  {% endif %}
+  </languageOfCataloging>
+</recordInfo>

templates/paragraph--contributor--data.html.twig

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+{{ elements.field_contributor_name_and_role }}~{{ elements.field_contributor_description }}