Filtering is the way a request XML packet indicates to which objects to apply an operation. Parameters nested in the filter node are called filtering rule.
The filter node is presented by the UserSelectionFilter type (user.xsd). Its graphical representation is as follows:

It specifies a user GUID. Data type: string.
It specifies the GUID of an owner of user accounts. Data type: integer.
It specifies a user ID in the Panel components (for example, Customer and Business Manager). Data type: string.
It specifies the ID of an owner of user accounts in the Panel components (for example, Business Manager). Data type: string.
It matches all users. Data type: none.
Examples
The following filter matches sites by id:
<filter>
<id>124</id>
<id>127</id>
</filter>
The following filter matches sites by names:
<filter>
<name>example.com</name>
<name>sample.com</name>
</filter>