validation fields

add more validation for repeatable fields

AoU-Model/src/main/java/ch/unige/aou/model/publication/MetadataCollection.java

+package ch.unige.aou.model.publication;
+
+import java.math.BigInteger;
+
+public class MetadataCollection {
+  private String name;
+  private BigInteger number;
+
+  public MetadataCollection(String name, BigInteger number) {
+    this.name = name;
+    this.number = number;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public BigInteger getNumber() {
+    return number;
+  }
+
+  public void setNumber(BigInteger number) {
+    this.number = number;
+  }
+}