filter (properties)

5reg

filter (properties)

Replaced by &xml-filterprop;

Content Model
    filter ::= (&xml-compact-filter;?, &xml-euler-filter;?,
                &xml-orbl-filter;?, &xml-realbdry-filter;?)
Attributes
See the general &xml-filter; element documentation.

&eltdepver;7.0

## Description

In ®ina; 6.0.1 and earlier, the &xml-filter; element was used to store different types of normal surface filters, and was held within an enclosing &xml-packet-surfacefilter; element. This page describes how the &xml-filter; element was structured when storing a property filter. Since ®ina; 7.0, each filter type now has its own &xml; element, which also serves as the &xml; element for the filter packet. In particular, property filters are now stored using the &xml-filterprop; element.

A property filter filters normal surfaces by examining basic topological properties such as orientability and Euler characteristic.

The specific constraints imposed by this filter are specified by its child &xml; elements. If this filter has several child elements, a surface must satisfy all of the corresponding constraints in order to be accepted by this filter.

More information about surface filters can be found in the general &xml-filter; element documentation.

### Parents

The following elements contain `filter`:

- &xml-packet-surfacefilter;

.

### Children

The following elements occur in `filter` for a filter by basic properties:

- &xml-compact-filter;
- &xml-euler-filter;
- &xml-orbl-filter;
- &xml-realbdry-filter;

.