In this pull request issue #25 was fixed. Yes,now with one empty mcid in struct elements we have empty struct element,but before to in lua mode if we have n mcids in struct element and m (m<n) from them empty,we have n-m mcids and now pdf become most valid. It was a problem to get correct mcid for n struct property,so I added a new key mcid for struct property.
In this pull request issue #25 was fixed. Yes,now with one empty mcid in struct elements we have empty struct element,but before to in lua mode if we have n mcids in struct element and m (m<n) from them empty,we have n-m mcids and now pdf become most valid. It was a problem to get correct mcid for n struct property,so I added a new key mcid for struct property.