Filter work items by tags with reportable rest API of RTC

One answer

You can try the following:
https://<server>:9443/ccm/rpt/repository/workitem?fields=workitem/workItem[tags=|xyz|]/*
which will return all work items having the tag xyz.
You can note that | is needed as tags are always separated by |, even if there is single tag. You can also use more filters.
Comments

Thank you for your answer.
I have tried this out. Unfortunately it only returns the work items where the given tag is the only tag. If a work item has also other tags, it won't be included in the result.
Is there any filter possibility like <tag> in <taglist> or <taglist>.contains(<tag>), which returns all work items which contain at least the given tag?