Validation errors:

Element '{http://pkp.sfu.ca}authors': Missing child element(s). Expected is ( {http://pkp.sfu.ca}author ).

Element '{http://pkp.sfu.ca}publication': Missing child element(s). Expected is one of ( {http://pkp.sfu.ca}abstract, {http://pkp.sfu.ca}coverage, {http://pkp.sfu.ca}type, {http://pkp.sfu.ca}source, {http://pkp.sfu.ca}rights, {http://pkp.sfu.ca}licenseUrl, {http://pkp.sfu.ca}copyrightHolder, {http://pkp.sfu.ca}copyrightYear, {http://pkp.sfu.ca}keywords, {http://pkp.sfu.ca}agencies ).

Element '{http://pkp.sfu.ca}article': Missing child element(s). Expected is one of ( {http://pkp.sfu.ca}id, {http://pkp.sfu.ca}submission_file, {http://pkp.sfu.ca}pkppublication, {http://pkp.sfu.ca}publication ).

Element '{http://pkp.sfu.ca}issue': Missing child element(s). Expected is ( {http://pkp.sfu.ca}articles ).

Invalid XML:

<?xml version="1.0" encoding="utf-8"?>
<issue xmlns="http://pkp.sfu.ca" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" published="1" current="0" access_status="1" url_path="" xsi:schemaLocation="http://pkp.sfu.ca native.xsd">
  <id type="internal" advice="ignore">447</id>
  <issue_identification>
    <volume>37</volume>
    <number>4</number>
    <year>2021</year>
  </issue_identification>
  <date_published>2021-12-01</date_published>
  <last_modified>2022-04-12</last_modified>
  <sections>
    <section ref="ART" seq="1" editor_restricted="0" meta_indexed="1" meta_reviewed="1" abstracts_not_required="0" hide_title="0" hide_author="0" abstract_word_count="0">
      <id type="internal" advice="ignore">195</id>
      <abbrev locale="en_US">ART</abbrev>
      <policy locale="en_US">&lt;p&gt;Section default policy&lt;/p&gt;</policy>
      <title locale="en_US">Articles</title>
    </section>
    <section ref="ED" seq="3" editor_restricted="0" meta_indexed="1" meta_reviewed="0" abstracts_not_required="1" hide_title="0" hide_author="0" abstract_word_count="0">
      <id type="internal" advice="ignore">212</id>
      <abbrev locale="en_US">ED</abbrev>
      <title locale="en_US">Editorial</title>
    </section>
  </sections>
  <issue_galleys xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://pkp.sfu.ca native.xsd"/>
</issue>