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
  (CLAUSE
    (CORE
      (NP (PRO-DEM 0=there))
      (NUC (V 1=was))
      (NP
        (OP-DEF 2=a)
        (CORE_N
          (AP-PERI (CORE_A (NUC_A (A 3=middle-aged))))
          (NUC_N (N 4=woman))
          (CLAUSE-PERI
            (CORE
              (OP-MOD 5=might)
              (NUC
                (OP-ASP 6=have)
                (AUX-ASP 7=been)
                (NP (OP-DEF 8=a) (CORE_N (NUC_N (N 9=jewess)))))))))
      (NUC (V 10=sitting) (PRT 11=up))
      (PP
        (CORE_P
          (NUC_P (P 12=in))
          (NP (OP-DEF 13=the) (CORE_N (NUC_N (N 14=bow))))))
      (PP-PERI
        (CORE_P
          (NUC_P (P 15=with))
          (NP
            (OP-DEF 16=a)
            (CORE_N
              (AP-PERI (CORE_A (NUC_A (A 17=little))))
              (NUC_N (N 18=boy))
              (AP-PERI
                (CORE_A
                  (NP
                    (CORE_N
                      (QP
                        (CORE_Q
                          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 19=about))))
                          (NUC_Q (QNT 20=three))))
                      (NUC_N (N 21=years))))
                  (NUC_A (A 22=old))))))
          (PP
            (CORE_P
              (NUC_P (P 23=in))
              (NP (OP-DEF 24=her) (CORE_N (NUC_N (N 25=arms))))))))))
  (. 26=.))