{%- macro last_modification(url) -%}
    {# @var url \SitemapPlugin\Model\SitemapUrlInterface #}
    {% if url.lastModification is not same as(null) %}
        <lastmod>{{ url.lastModification|date('c') }}</lastmod>
    {% endif %}
{%- endmacro %}

{%- macro change_frequency(url) -%}
    {# @var url \SitemapPlugin\Model\SitemapUrlInterface #}
    {% if url.changeFrequency is not same as(null) %}
        <changefreq>{{ url.changeFrequency }}</changefreq>
    {% endif %}
{%- endmacro %}

{%- macro priority(url) -%}
    {% if url.priority is not same as(null) %}
        <priority>{{ url.priority }}</priority>
    {% endif %}
{%- endmacro %}