Add block from Luma parent into child theme

Question

I'm using a custom child theme with Luma as the parent, I have a custom page layout xml file and I'd like to include a block that's defined in the parent theme:

<block class="Magento\Theme\Block\Html\Title" name="page.main.title" template="Magento_Theme::html/title.phtml"/>

Adding the above into a <container> in my custom.xml page layout file does nothing, seeing as I'm not looking to modify the parent theme block, do I have to copy title.phtml to my child theme and use that?

If that's the case so be it, but if I can add unmodified parent blocks without duplicating their files that would be ideal, as I have many parent blocks to add to many custom page layouts.

I'm hoping I just need to change the "template" and/or "class" parameters in the code above to achieve this.

Note that my own custom template blocks inside my child theme folder show up as expected in my custom page layouts, so I don't believe I've misidentified this issue.

Answer 1

As page.main.title is in the default.xml it is already available on every page. To set a new title you need to use a referenceBlock and set the page title via an argument.

<referenceBlock name="page.main.title">
    <action method="setPageTitle">
        <argument translate="true" name="title" xsi:type="string">My own title</argument>
    </action>
</referenceBlock>