All matching files in the directory must have similar structure

You are about to add a directory source that may contain several matching files (e.g. *.xml). All files must have similar data structure. They do not have to be identical but they must contain the same kind of elements.

For example in the case of XML files the XML schema or DTD must be the same. In the case of INI files the files must contain same set of sections and sections must contain same sets of idents. However the actual values can be different.