The default number of nodes that TopBraid Composer displays in trees is limited to what we observed to be realistically handled by the underlying UI libraries (which in our case is https://help.eclipse.org/2019-12/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fapi%2Forg%2Feclipse%2Fjface%2Fviewers%2FTreeViewer.html). Other frameworks may scale better, but that's nothing we can realistically work around. In any case, having a tree display hundreds of thousands of sibling nodes sounds a bit steep. I guess you'd really just want to navigate to certain nodes, and that could be achieved by tabular views too. Have you tried to increase the "Max. number of instances to display" in the TBC preferences?

Holger


On 17/02/2020 04:30, Derek S wrote:
Apologies for the slow reply. Thanks for details.
This doesn't seem to be a problem in Protege. I'm working on other ontologies with 300k+ classes (in the main these are converted from OBO, so have a class explosion when converted to OWL). However, it's not an uncommon practice in biology. Is there an architectural difference between TBC and Protege, that allows a greater number of classes in the entity navigators?

On Monday, 23 September 2019 14:45:22 UTC+1, Derek S wrote:

    I have opened a file with 133K classes. No errors reported, but I
    can't see all the classes in the class navigator. Other symptoms:
    (i) If I search for a specific class that is not present in the
    navigator the search is returned, but if I click on a class from
    the search result window, then the search result window closes and
    I'm returned to the class navigator and the previous current class.
    (ii) if I save the file from TBC as another name and check it with
    vi, all the classes are present.

    So the import is fine, all the classes are loaded, but not visible
    in the navigator. I seem to remember that the navigator only shows
    a limited number. Is it possible for it to show all the classes?

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