Custom ontologies: unable to create

Omeka S
1

I am currently planing and testing Omeka S for building an online cassettography. In fact the idea is to move from MediaWiki to Omega S for this project: https://african-cassettes.uni-mainz.de.
Since a lot of the properties we use in this project are not (yet) included in standard ontologies I have to create a new ontology using the module “Custom ontologies”.

But for some reason I was unable to create a new ontology. My steps are the following:

  1. I create a new ontology by entering
    Namespace uri: https://www.omeka-s.african-cassettes.de/ns/tk7/
    Prefix: tk7
    Label: testk7
    and add a comment;

then I enter a couple of classes and properties I want to create, such as
in the field “Create specific classes”:
testk7:CassetteAlbums

and “Create specific properties”

testk7:trackinglist
testk7:arrangement
testk7:recordingstudio
testk7:label
testk7:labelnumber
testk7:labelplace
testk7:distribution
testk7:distributionnumber
testk7:distributionplace

  1. When I finally click on “Get turtle” I get an error message "No ontology exists for prefix “testk7"” for every class and property.

What is my mistake? As far as I understand the explanatory text “The next three forms are independant, and can be used together (for a new ontology)” I should be able to create a new ontology by filling all three forms together. But it looks like I’m overlooking something.
A helpful answer is highly appreciated.

2

Hi there, it’s been a while since I used this module but I believe you need to use the prefix “tk7” on your class and properties, i.e. “tk7:CassetteAlbums”, “tk7:trackinglist”, “tk7:arrangement”.
Or you should change the prefix in the first part to “Prefix: testk7” instead. I think the label and prefix can be the same.

3

Hi Allana,

thank you very much for your reply!

I tried it with prefix and label “tk7” and then get an error message for every row like:
" The term “tk7:CassetteAlbums” must have a label."

4

Yes, you need to include a human-readable label after each term, separated by a comma.

So, you would enter, one line each:
tk7:trackinglist,Tracking List
tk7:arrangement,Arrangement
etc.

You can also include comments that help explain what the field is for; I think the comments are optional but you may find an error that declares them to be mandatory too.

So, something like:
tk7:trackinglist,Tracking List,The list of the tracks in order on the cassette, including Side A and Side B designations.
tk7:arrangement,Arrangement,Information about the instrumentation on the cassette.

5

Tank you very much!!
That was the solution. From the explanation in the module it was not really clear to me that the human-readable label has to be added in that way.
Thank you!