Invalid Tag Elements - Coding query

Morning all,

I've got an excel sheet which I use for managing tag values in my DGN's title blocks. Now all works fine when the tags are valid but for some reason if I work in a file that contains existing invalid tag elements which for some reason are invalid, it causes my excel sheet to stop working. My excel sheet operates by checking for a specific tagset yet these invalid tags are not from my tagset and it would be too much work delete and add valid tags in each file.

I noticed from the object browser that the tag element class has an isvalid property. Is there any way to have my import process (ie scanning target DGN file for tags and populating my spreadsheet with values of specific tags) ignore invalid tags so it will continue to return the tags I am looking for?

Thanks

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