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https://issues.apache.org/jira/browse/WICKET-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783369#action_12783369
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Juergen Donnerstag commented on WICKET-2569:
--------------------------------------------
your baseclass contains <wicket:child>, which means your subclass must provide
the wicket:extend markup. Wicket should rather throw an exception in case there
is no sub-markup, than silently ignore wicket:child.
> Inheritance layout excludes XML header from output
> --------------------------------------------------
>
> Key: WICKET-2569
> URL: https://issues.apache.org/jira/browse/WICKET-2569
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 1.3.7, 1.4.3
> Reporter: Neil Curzon
> Attachments: wicket-2569.tgz
>
>
> When using inheritance layout, if the superclass (Layout class) has an ?xml
> header at the top, it's excluded from the rendering of subclasses, if they
> have an associated html file. If the subclass has no .html file associated
> with it, the ?xml header is preserved in the rendering output.
> To reproduce: Create a SuperPage class extending WebPage. At the top of
> SuperPage.html, put "<?xml version="1.0" encoding="utf-8"?>" . Create two
> subclasses of SuperPage, one with an HTML file and one without. View the sub
> pages. Notice when the one with an HTML file is rendered, the xml header is
> excluded.
> Expected: The ?xml header should always be preserved in the rendered output
> as it's vital to the layout.
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