add page for transition state toward 1.4

content/trans_14.md

++++
+Description = ""
+Tags = ["Development", "golang"]
+Categories = ["Development", "GoLang"]
+menu = "main"
++++
+
+# Transition to version 1.4
+
+A new version 1.4 of **Grew** will be available in the upcoming weeks with a few changes in the syntax.
+
+For some technical reason, the [**Grew-match**](http://match.grew.fr) online tool is already based on the upcoming version and so already uses the new syntax.
+The `dev` version of the **Grew** API for **Arborator-Grew** also uses the new syntax.
+
+## Clustering on the label of an edge
+
+With the pattern:
+
+```grew
+pattern { e: M -> N; N [upos=ADJ]}
+```
+
+if you want to cluster the result on the label of the edge `e`, the old syntax was `e`, the new one is `e.label` ([Try it!](http://match.grew.fr/?corpus=SUD_French-GSD@latest&clustering=e.label&pattern=pattern%20%7B%20N%20-%3E%20M;N%20[upos=ADJ]%20%7D)).
+
+## Access to the label of an edge in the pattern
+
+|Constraint | Old syntax | New syntax |
+|:-----------------:|:-----------------:|:-----------------:|
+| equality of two edge labels | `label(e1) = label(e2)` |  `e1.label = e2.label` |
+| inequality of two edge labels | `label(e1) <> label(e2)` |  `e1.label <> e2.label` |
+
+## Avoiding duplicate solutions
+
+When several nodes are equivalent in a pattern, each occurrence is reported several times (up to permutation on the set of equivalent nodes).
+For instance, to search for two relations `det` with the same governor, the pattern below will return twice each solution.
+
+```grew
+pattern {
+  G -[det]-> D1;
+  G -[det]-> D2;
+}
+```
+
+To avoid this, it is possible to give an ordering constraint on some internal identifier:
+
+ * old_syntax: `id(D1) < id (D2)`
+ * new_syntax: `D1.__id__ < D2.__id__`
+
+The complete pattern is:
+
+```grew
+pattern {
+  G -[det]-> D1;
+  G -[det]-> D2;
+  D1.__id__ < D2.__id__;
+}
+```
+