query:
  16: |-
    (
      way[building];
      relation[building];
    )
feature:
  pre: |-
    {% set type = tags.building|split(';')[0] %}
    {% if tags.military %}{% set type = 'military' %}{% endif %}

    {% set start_date = tags.start_date %}
    {% if attribute(tags, 'building:start_date') %}{% set start_date = attribute(tags, 'building:start_date') %}{% endif %}
    {# Deprecated tags #}
    {% if not start_date and attribute(tags, 'building:age') %}{% set start_date = attribute(tags, 'building:age') %}{% endif %}
    {% if not start_date and attribute(tags, 'building:year_built') %}{% set start_date = attribute(tags, 'building:year_built') %}{% endif %}
    {% if not start_date and attribute(tags, 'building:buildyear') %}{% set start_date = attribute(tags, 'building:buildyear') %}{% endif %}
    {% if not start_date and attribute(tags, 'year_built') %}{% set start_date = attribute(tags, 'year_built') %}{% endif %}
    {% if not start_date and attribute(tags, 'building:year') %}{% set start_date = attribute(tags, 'building:year') %}{% endif %}
    {% if not start_date and attribute(tags, 'year_of_construction') %}{% set start_date = attribute(tags, 'year_of_construction') %}{% endif %}

    {% if start_date %}
      {# equalize tagging mistakes - need to add QA messages #}
      {# convert 1910-1911 to 1910..1911 #}{% set m = start_date|matches('^(\d{4})-(\d{4})$') %}{% if m %}{% set start_date = m[1] ~ '..' ~ m[2] %}{% endif %}
      {# convert 191* to 1910s #}{% set m = start_date|matches('^(\d{3})\*$') %}{% if m %}{% set start_date = m[1] ~ '0s' %}{% endif %}


      {% set value = start_date|osmParseDate %}
      {% if value and value[0] and value[1] %}
        {% set value = (value[1] - value[0]) / 2 + value[0] %}
      {% elseif value and value[0] %}
        {% set value = value[0] %}
      {% elseif value and value[1] %}
        {% set value = value[1] %}
      {% else %}
        {% set value = 'error' %}
      {% endif %}

      {% if value == 'error' %}
        {% set color = '#ff0000' %}
      {% elseif value < 1500 %}
        {% set color = '#0000ff' %}
      {% elseif value < 1900 %}
        {% set color = colorInterpolate([ '#0000ff', '#ff00ff' ], (value - 1500.0) / 400) %}
      {% elseif value < 2000 %}
        {% set color = colorInterpolate([ '#ff00ff', '#ffff00' ], (value - 1900.0) / 100) %}
      {% else %}
        {% set color = colorInterpolate([ '#ffff00', '#00ff00' ], (value - 2000.0) / 50) %}
      {% endif %}
    {% else %}
    {% set color = '#7f7f7f' %}
    {% endif %}
  description: |-
    {% if tags.building == 'yes' and tags.military %}
    {{ tagTrans('building', 'military') }}
    {% elseif tags.building == 'yes' %}
    {{ keyTrans('building') }}
    {% else %}
    {{ tagTransList('building', tags.building) }}
    {% endif %}
    {% if tags.building == 'construction' and tags.construction %}
    ({{ tagTransList('building', tags.construction) }})
    {% endif %}
    {% if tags.building in  [ 'yes', 'military' ] and tags.military %}
    ({{ tagTransList('military', tags.military) }})
    {% endif %}
  details: |-
    {% if start_date %}
    {{ start_date|osmFormatDate({ format: 'short' }) }}
    {% else %}
    {{ trans('unknown') }}
    {% endif %}
  body: |-
    <ul>
    {% if attribute(tags, 'building:start_date') %}<li>
    <span class='key'>{{ keyTrans('building:start_date') }}:</span>
    <span class='value'>{{ attribute(tags, 'building:start_date')|osmFormatDate }}</span>
    </li>{% endif %}
    </ul>
  markerSymbol: null
  listMarkerSymbol: |-
    {{ markerPolygon({ "fillColor": color, "fillOpacity": 0.8, "width": 1, "color": "#000000" })|raw }}
  priority: |-
    {% set p = 100 %}
    {% if start_date %}{% set p = p - 20 %}{% endif %}
    {% if tags.name %}{% set p = p - 10 %}{% endif %}
    {% if tags.amenity %}{% set p = p - 1 %}{% endif %}
    {% if tags.historic %}{% set p = p - 1 %}{% endif %}
    {% if tags.culture %}{% set p = p - 1 %}{% endif %}
    {% if tags.highway %}{% set p = p - 1 %}{% endif %}
    {% if tags.railway %}{% set p = p - 1 %}{% endif %}
    {% if tags.aeroway %}{% set p = p - 1 %}{% endif %}
    {% if tags.amenity %}{% set p = p - 1 %}{% endif %}
    {% if tags.tourism %}{% set p = p - 1 %}{% endif %}
    {{ p }}
  style:
    width: 1
    color: '#000000'
    fillColor: '{{ color }}'
    fillOpacity: 0.8
info: |-
  <table>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1400" }))|raw }}</td>
      <td>&lt;1500</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1500" }))|raw }}</td>
      <td>1500</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1600" }))|raw }}</td>
      <td>1600</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1700" }))|raw }}</td>
      <td>1700</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1800" }))|raw }}</td>
      <td>1800</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1900" }))|raw }}</td>
      <td>1900</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "1950" }))|raw }}</td>
      <td>1950</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "2000" }))|raw }}</td>
      <td>2000</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "2020" }))|raw }}</td>
      <td>2020</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes", "start_date": "xxx" }))|raw }}</td>
      <td>{{ repoTrans('date format not understood') }}</td>
    </tr>
    <tr>
      <td>{{ markerPolygon(evaluate({ "building": "yes" }))|raw }}</td>
      <td>{{ trans('unknown') }}</td>
    </tr>
  </table>