Can schema.org's email property use the href value?
html,email,schema.org,microdata
Schema.org’s email property expects Text as value. It’s odd. In my opinion it should take URL instead, or at least allow boths ways ("Text or URL", as it’s the case with the menu property, too). I can only guess that they chose Text because some publishers don’t want to specify...
Where to add Rich snippet - Organization schema for a general page
schema.org,google-rich-snippets
It's not necessary to put it on every page, but you should definitely insert it into pages such as the About page and Contact page, and you could also insert it into the homepage if there is an appropriate place for you to do so. You will just want to...
schema.org microdata: Do as schema.org says, or as Google says?
schema.org,microdata,google-rich-snippets
I would use schema.org. The high prevelance of the year "2011" on that Google page makes me have a feeling that it is older content that hasn't been updated or removed. I used schema.org structured data elements on a site I maintain, and all of those elements show up correctly...
Can I have multiple images marked up in a schema.org ImageObject?
If you’d use one ImageObject with multiple contentUrl properties, it would mean that you have one image with several URLs. If you have several images, use an own ImageObject item for each....
Opening hours go over midnight
I don’t have any experience with this, but I would have assumed that using opens and closes like that should be fine, as their descriptions say The opening hour of the place or service on the given day(s) of the week. The closing hour of the place or service on...
Content-Type for Email Markup Actions
email,mime-types,content-type,schema.org,google-schemas
You have to include it in the email’s HTML (text/html). Google (i.e., Gmail and Inbox by Gmail) supports JSON-LD and Microdata: The JSON-LD will be included in a script element (used as data block). The Microdata attributes (like itemscope and itemprop) will be added directly to the (existing) HTML elements....
Why is my schema.org rating markup for a place not being shown by Google?
schema.org,google-webmaster-tools,microdata
Google will not typically display an aggregate rating rich snippet for a "Place" itemtype. They do show it, though, for more specific place types, such as for restaurants and other local business types. So you might need to get more specific with your markup. On a different note, hiding marked...
Is it good to use ItemPage (schema.org) to my courses?
If the page is about a single course, then yes, you may use ItemPage. As a general rule, always go with the most specific type. So if you have a WebPage, check its "More specific Types"; if one of the types applies to your case, select it; otherwise, keep WebPage....
News item in Schema.org
The Schema.org type Article is appropriate, as its description says (bold emphasis mine): An article, such as a news article or piece of investigative report. […] But you can even be more specific by using the NewsArticle type (note that by using this type, your news post is also an...
Do I need to repeat all the categories on all sub-pages?
Schema.org doesn’t define any required properties, so everything is optional. But note that there is no concept of "website" in Microdata. The Microdata always gets parsed per document. So if a Microdata consumer parses your "Special Offer Weekend in New York" page, it will not get the telephone/address/etc. of the...