# Metadata filters

Metadata filters are routines with which **LIBSAFE** can process a metadata file and integrate its information into the object cataloging system. Filters can be from processes for the application of XML transformation sheets to complex processes that will check the correct formation and process information about the object (like, for example, the process of a METS containing metadata to be absorbed), but also information about the structure of the object that needs to be contrasted. 

![](/files/-MjjT7s1z53B3sV0_iVQ)

Metadata filters in a standard **LIBSAFE** installation include:

* **Empty Metadata Filter**. It does not add any metadata information to the catalog. The metadata filter selection being mandatory, this filter solves the situation if we do not wish to import metadata or if we do not have any metadata associated to the preserved objects.
* **Simple Metadata Filter**. It allows for importing metadata from any XML to any metadata schema, by using XSLT transformation sheets.    
* **Marc21 METS metadata filter.** It is a filter to import standard Marc21 METS.
* **Object Name Metadata Filter**. It imports the object name as a descriptor. This descriptor will be the only one included in the metadata schema.
* **Marc21 METS Droid metadata filter.**
* **Simple metadata filter plus object name.**
* **EAD3 METS** **metadata filter.**


---

# 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.libnova.com/libsafe-advanced-preservation-administrator-manual/preservation-configuration-basic-sections/metadata-filters.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.