# Filter Function

{% hint style="warning" %}
IMPORTANT: The filters can be used only after you have already started a search and the first search results are displayed.
{% endhint %}

A search can also be narrowed down by using the **Filter function**. This function can be combined with the Advanced Search and with the use of keywords and operators in the search field.

The Filter function also has the advantage that it displays search results in subgroups. This gives an overview of all possible intersections of a certain search term with various parameters, such as Object Types, Persons, Places or Media, etc. With the help of the Filter function, one can get an overview of the differeent types of data that are retrieved by searching in the Census.

The 'Filter' menu is located on the left side below the search line and can be opened by clicking on the appropriate button.

You will then find various subsets of data in the Filter menu, which you can use to narrow down a set of results further. The number of records contained in each subset is displayed to the right of the subset. For example, there are 1,001 Postclassical Works and 476 Antique Monuments in the Census that result from a search using the keyword Apollo. There are a total of 26 records related to this keyword that contain downloadable images.

<figure><img src="/files/DnRpPH3R2lp6AtYu55Ia" alt="" width="375"><figcaption></figcaption></figure>

In this section you will find three examples of how to narrow down your search results using the Filter function:

{% content-ref url="/spaces/QXkdVwY1QIoMKRN8Omas/pages/j1R6qunnlc0zxBJP3q4v" %}
[Filter by Alias](/navigating-and-searching/filter-function/filter-by-alias.md)
{% endcontent-ref %}

{% content-ref url="/spaces/QXkdVwY1QIoMKRN8Omas/pages/uNQUTPzUXeoEpEGfH8va" %}
[Filter by Medium](/navigating-and-searching/filter-function/filter-by-medium.md)
{% endcontent-ref %}

{% content-ref url="/spaces/QXkdVwY1QIoMKRN8Omas/pages/mJXBS4lqcLEMko55ji2g" %}
[Filter by Location](/navigating-and-searching/filter-function/filter-by-location.md)
{% endcontent-ref %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.census.de/navigating-and-searching/filter-function.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.