If the target schema is present, you can add elements and attributes from the target tree to the XSLT pane.

You can either use the context menu for an XSLT element or attribute to add a related element/attribute, or drag and drop the desired element/attribute from the target tree to the XSLT tree.

If elements are placed in positions that are inconsistent with the target schema, or if the editor cannot yet determine if the element is valid at the location due to an incomplete XSLT map, then a question mark is shown over the element's icon. The following figure shows an XSLT tree where the Item element is marked with a question mark.