Morpho

I had a data package containing a data table with two attributes, Column 1 and
Column 2. I opened morpho's editor, clicked on "Show All", and expanded
dataTable/CHOICE/SEQUENCE/attributeList/CHOICE/attribute-Column
1/CHOICE/SEQUENCE. I right-clicked on the missingValueCode node and selected
"Copy Node & Children". I then right-clicked on "attribute-Column 2" and
selected "Paste as Sibling to Selected Node". [I actually wanted to paste the
missingValueCode node under attribute-Column 2/CHOICE/SEQUENCE/ (where this node
should be in theory), but the editor didn't give me this option.] I entered -999
in the missingValueCode field and clicked on "Trim". I expanded dataset/CHOICE
and noticed that spatialVector (with its box checked in) appeared under
dataTable, although I had not created this node. When I clicked on OK to close
the editor, I got a window filling my screen with a list of 59 nodes under
eml/dataset/CHOICE/datatable/CHOICE/SEQUENCE/physical/CHOICE/SEQUENCE/dataFormat/CHOICE/externallyDefinedFormat/citation/CHOICE/SEQUENCE/CHOICE/conferenceProceedings/
and
eml/dataset/CHOICE/datatable/CHOICE/SEQUENCE/physical/CHOICE/SEQUENCE/dataFormat/CHOICE/externallyDefinedFormat/citation/CHOICE/SEQUENCE/CHOICE/personalCommunication.
The only way to get out of there was to press "Esc".