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    <p>Hey,</p>
    <p>The lists.yml file in my layer looks like this:</p>
    <div style="color: #d4d4d4;background-color: #1e1e1e;font-family: 'Droid Sans Mono', 'monospace', monospace, 'Droid Sans Fallback', 'Noto Color Emoji';font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div><span style="color: #569cd6;">_prefix</span><span style="color: #d4d4d4;">:</span></div><div><span style="color: #d4d4d4;">  </span><span style="color: #569cd6;">lists</span><span style="color: #d4d4d4;">:</span></div>
<div><span style="color: #569cd6;">oa_version</span><span style="color: #d4d4d4;">:</span></div><div><span style="color: #d4d4d4;"> - </span><span style="color: #ce9178;">"None"</span></div><div><span style="color: #d4d4d4;"> - </span><span style="color: #ce9178;">"Draft"</span></div><div><span style="color: #d4d4d4;"> - </span><span style="color: #ce9178;">"Preprint"</span></div><div><span style="color: #d4d4d4;"> - </span><span style="color: #ce9178;">"Submitted Version"</span></div><div><span style="color: #d4d4d4;"> - </span><span style="color: #ce9178;">"Published Version"</span></div><div><span style="color: #d4d4d4;"> - </span><span style="color: #ce9178;">"Updated Version"</span></div>
<div><span style="color: #569cd6;">ddc</span><span style="color: #d4d4d4;">:</span></div><div><span style="color: #d4d4d4;">  </span><span style="color: #b5cea8;">000</span><span style="color: #d4d4d4;">:</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #569cd6;">optgroup</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"000 Computer science, information & general works"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">000</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 000 Computer science, knowledge & systems"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">004</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"---- 004 Data processing, computer science, computer systems"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">006</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"---- 006 Computer science, knowledge & systems"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">020</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 020 Library & information sciences"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">070</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 070 News media, journalism & publishing"</span></div><div><span style="color: #d4d4d4;">  </span><span style="color: #b5cea8;">500</span><span style="color: #d4d4d4;">:</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #569cd6;">optgroup</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"500 Science"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">510</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 510 Mathematics"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">520</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 520 Astronomy"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">530</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 530 Physics"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">540</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 540 Chemistry"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">550</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 550 Earth sciences & geology"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">560</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 560 Fossils & prehistoric life"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">570</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 570 Life sciences; biology"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">572</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"---- 572 Biochemistry"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">580</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 580 Plants (Botany)"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">590</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 590 Animals (Zoology)"</span></div><div><span style="color: #d4d4d4;">  </span><span style="color: #b5cea8;">600</span><span style="color: #d4d4d4;">:</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #569cd6;">optgroup</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"600 Technology"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">600</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 600 Technology"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">610</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 610 Medicine & health"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">620</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 620 Engineering"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">630</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 630 Agriculture"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">660</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 660 Chemical engineering"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">660.6</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"---- 660.6 Biotechnology"</span></div><div><span style="color: #d4d4d4;">    </span><span style="color: #b5cea8;">690</span><span style="color: #d4d4d4;">: </span><span style="color: #ce9178;">"-- 690 Building & construction"</span></div><div><span style="color: #d4d4d4;"> </span></div></div>
    <p><br>
    </p>
    <p>There reason I believed there was merging going on was because I
      added an extra line in one of the ddc lists above, as a test, then
      after generating the forms the new line appeared but also with the
      total ddc list. So my reduced list, plus the extra test line, plus
      the rest of the list defined in the non-layer lists.yml file
      appeared in the ddc field of the forms.<br>
    </p>
    <p><br>
    </p>
    <p>Jonathan</p>
    <p>IST Austria<br>
    </p>
    <p><br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 06/14/2018 09:41 AM, Nicolas
      Steenlant wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:13EF278B-4D18-4299-8B22-67ED190F9832@ugent.be">
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      Hello Jonathan,
      <div class=""><br class="">
      </div>
      <div class="">lists in the config don’t get merged, are you sure
        you’re overriding the right key?</div>
      <div class=""><br class="">
      </div>
      <div class="">Regards,</div>
      <div class="">Nicolas <br class="">
        <div class="">
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            --</div>
          <div style="color: rgb(0, 0, 0); font-family: Helvetica;
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            Nicolas Steenlant</div>
          <div style="color: rgb(0, 0, 0); font-family: Helvetica;
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            software developer at University Library Ghent<br class="">
            <br class="">
          </div>
        </div>
        <div><br class="">
          <blockquote type="cite" class="">
            <div class="">On 14 Jun 2018, at 09:37, Jonathan NORRIS <<a
                href="mailto:jnorris@ist.ac.at" class=""
                moz-do-not-send="true">jnorris@ist.ac.at</a>> wrote:</div>
            <br class="Apple-interchange-newline">
            <div class="">
              <div class="">Hello,<br class="">
                <br class="">
                I was wondering if there is a way to totally override a
                config item? For example, I want to reduce the amount
                displayed by the DDC list in lists.yml. So in my layer I
                have a lists.yml file with a reduced DDC list. But when
                rebuilding the forms I see no difference, I still get
                the full list, presumably as it is merged with the
                original list outside of my layer.<br class="">
                <br class="">
                Is there a way to stop this merging for a particular
                config item? Its great when you want to expand the
                config, but is there a strategy when you want to reduce
                something?<br class="">
                <br class="">
                <br class="">
                Thanks,<br class="">
                <br class="">
                Jonathan<br class="">
                <br class="">
                IST Austria<br class="">
                <br class="">
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            </div>
          </blockquote>
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