code: public void setSources(java.util.Collection<InputSource> sources) {
          if (sources == null) {
              this.sources = null;
              return;
          }
  
          this.sources = new java.util.ArrayList<InputSource>(sources);
      }
docs: A list of the sources of the input (PULL-type).
  
  @param sources
  A list of the sources of the input (PULL-type).