ph-schematron/src/main/java/com/helger/schematron/pure/binding/xpath/PSXPathVariables.java
@Nonnull
  public EChange add (@Nonnull final Map.Entry <String, String> aEntry)
  {
    return add (aEntry.getKey (), aEntry.getValue ());
  }
@Nonnull
  public EChange add (@Nonnull final Map.Entry <String, String> aEntry)
  {
    return add (aEntry.getKey (), aEntry.getValue ());
  }
Add a new variable.

@param aEntry
The entry to be added - key is the variable name and value is the
variable value. May not be <code>null</code>.
@return {@link EChange#UNCHANGED} if a variable with the same name is
already present. Never <code>null</code>.