Magento 2 referenceBlock Location in layout File

Question

In default.xml of the magento/module-theme Module we have the following referenceBlock on Line 19:

        <referenceBlock name="top.links">
        <block class="Magento\Theme\Block\Html\Header" name="header" as="header" before="-">
            <arguments>
                <argument name="show_part" xsi:type="string">welcome</argument>
            </arguments>
        </block>
    </referenceBlock>

In which layout file is the block with Name 'name="top.links"' defined ? It is referred, so it has to be defined in some layout XML file.

Answer 1

Here is the layout file that the top.links block is defined

vendor/magento/module-theme/view/frontend/layout/default.xml