public PsiElement getValueDeclaration(XmlElement attributeValue, String value) {
    String defaultValue = getDefaultValue();
    if (Objects.equals(defaultValue, value)) {
      return getDefaultValueDeclaration();
    }
    return isFixed() ? null : getEnumeratedValueDeclaration(attributeValue, value);
  }
public PsiElement getValueDeclaration(XmlElement attributeValue, String value)