creates a candidate based on element

(create-candidate {:origin :ns :ns “code.doc”}) => “ns-code-doc”

creates a tag based on element and existing tags

(create-tag {:title “hello”} (atom #{“hello” “hello-0” “hello-1” “hello-2”})) => {:title “hello”, :tag “hello-3”}

creates additional candidates

(inc-candidate “hello”) => “hello-0”

(inc-candidate “hello-10”) => “hello-11”

link tags to all elements for a particular article

creates a tag based on string

(tag-string “hello2World/this.Rocks”) => “hello2-world–this-rocks”