Vocabulary: Attribute vs. Mark vs. Sign vs. Feature

Hello,

I'm looking for the best expression. So far, attribute has seemed the best. What do native speakers here think about this?

Context:
"...
At the same time, a distinction is made between whether the document is complete, or whether there is still a part of the order that remains to be processed. Attributes of the individual documents then enable us to easily search for orders by desired criteria such as unfinished, unprepared, unordered, etc.
..."

Thanks for any help!

P.