code: public static ObjectTypeAttributeDefinition.Builder getAttributeBuilder(String name, String xmlName, boolean allowNull) {
          return getAttributeBuilder(name, xmlName, allowNull, false);
      }
docs: Get an attribute builder for a credential-reference attribute with the specified characteristics. The
  {@code store} field in the attribute does not register any requirement for a credential store capability.
  
  @param name name of attribute
  @param xmlName name of xml element
  @param allowNull {@code false} if the attribute is required
  @return an {@link ObjectTypeAttributeDefinition.Builder} which can be used to build an attribute definition