void pushImportSource(Source sourceFromURIResolver){
  m_importSourceStack.push(sourceFromURIResolver);
}

void pushImportSource ( Source sourceFromURIResolver ) { m_importSourceStack . push ( sourceFromURIResolver ) ; }
push the source of an import href onto the stylesheet stack , obtained from a uriresolver , null if there is no uriresolver , or if that resolver returned null .
