in the Structured Testing Tool the follow error message is shown: Unspecified Type
if i remove the line <base href="http://www.domain.com" />it is fine.
So you must have another line of code you have added that is causing the validator to spit out "unspecified type" when the base tag is set (it seems isolated to your specific list, not all VisioLists).
I want to add open graph tags.
Plz add the following line to the left box of your site's report and press validate button:
<meta property="og:locale" content="en_US" />
You will see "Unspecified Type"
This isuue is related to open graph and base href tag.
Plz check it
If you look at your screenshot, you have added an extra line that is not on my site Try putting <meta property="og:locale" content="en_US" /> BEFORE the base tag as it is on my site, I am just not able to reproduce this "issue".
Sorry i am still not able to reproduce, can i ask what the problem is? I mean, its showing 0 errors, 0 warnings. What is this line preventing you from doing? Why is this validation so important? is it possible this is a bug with the validator?
base URL has absolutely nothing to do with structured data, its only used for relative paths. I think you need to speak with Google about this... the base URL and your "unspecified type" really have zero relationship. I think this is a bug in their validator and you are thinking your will penalized, but I highly doubt you would be, again it has nothing to do with structured data.
Anyway, you can remove the base meta tag, but you would need to ensure you are using absolute paths when loading images and other assets in your template files. Personally, I don't think its worth it.