RRGparbank

To change a label, click on a node to select a different label from a list. The syntactic category and the function tag (before and after the dash "-") must be selected separately by clicking on the corresponding part of the label.
To add a function tag to a node that does not have one yet, drag it from the list of function tags onto the node.
Re-attach a node by dragging and dropping it on a new parent. This can be used to created discontinuous constituents.
Similarly, nodes can be removed and new ones added by dragging to/from below the tree.
Finally, the bracketing can be edited manually in the text box below the tree; press "validate" to update the tree. Whitespace is ignored. Each token must have a dedicated POS tag.

				[...wait for it...]

(SENTENCE
  (NP
    (OP-DEF 0=A)
    (CORE_N (AP-PERI (CORE_A (NUC_A (A 1=half-hour)))) (NUC_N (N 2=railway) (N 3=journey)))
    (: 4=;))
  (CLAUSE
    (CORE
      (NUC (V 5=turn) (A 6=left))
      (PP-PERI
        (CORE_P (NUC_P (P 7=outside)) (NP (OP-DEF 8=the) (CORE_N (NUC_N (N 9=station)))))))
    (: 10=;))
  (CLAUSE
    (CORE
      (NP
        (CORE_N
          (QP-PERI (CORE_Q (NUC_Q (QNT 11=two))))
          (NUC_N (N 12=kilometres))
          (PP-PERI
            (CORE_P
              (NUC_P (P 13=along))
              (NP (OP-DEF 14=the) (CORE_N (NUC_N (N 15=road))))))
          (. 16=:)))
      (NP
        (OP-DEF 17=a)
        (CORE_N
          (NUC_N (N 18=gate))
          (PP-PERI
            (CORE_P
              (NUC_P (P 19=with))
              (CORE
                (NP
                  (OP-DEF 20=the)
                  (CORE_N
                    (AP-PERI (CORE_A (NUC_A (A 21=top))))
                    (NUC_N (N 22=bar))))
                (NUC (V 23=missing))))))))
    (, 24=;))
  (NP
    (OP-DEF 25=a)
    (CORE_N
      (NUC_N (N 26=path))
      (PP-PERI
        (CORE_P
          (NUC_P (P 27=across))
          (NP (OP-DEF 28=a) (CORE_N (NUC_N (N 29=field)))))))
    (, 30=;))
  (NP
    (OP-DEF 31=a)
    (CORE_N (AP-PERI (CORE_A (NUC_A (A 32=grass-grown)))) (NUC_N (N 33=lane)))
    (. 34=;))
  (NP
    (OP-DEF 35=a)
    (CORE_N
      (NUC_N (N 36=track))
      (PP-PERI (CORE_P (NUC_P (P 37=between)) (NP (CORE_N (NUC_N (N 38=bushes)))))))
    (. 39=;))
  (NP
    (OP-DEF 40=a)
    (CORE_N
      (AP-PERI (CORE_A (NUC_A (A 41=dead))))
      (NUC_N (N 42=tree))
      (PP-PERI
        (CORE_P
          (NUC_P (P 43=with))
          (NP
            (CORE_N
              (NUC_N (N 44=moss))
              (PP-PERI (CORE_P (NUC_P (P 45=on)) (NP (PRO 46=it))))))))))
  (. 47=.))