code: @SuppressWarnings("static-method")
  	protected String transformURLAnchor(File file, String anchor, ReferenceContext references) {
  		String anc = anchor;
  		if (references != null) {
  			anc = references.validateAnchor(anc);
  		}
  		return anc;
  	}
docs: Transform the anchor of an URL from Markdown format to HTML format.
  
  @param file the linked file.
  @param anchor the anchor to transform.
  @param references the set of references from the local document, or {@code null}.
  @return the result of the transformation.
  @since 0.7