curl -XGET --user username:apikey "https://www.bibsonomy.org/api/users?end=2"

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<bibsonomy stat="ok">
  <users start="0" end="2" next="https://www.bibsonomy.org/api/users?start=2&amp;end=4">
    <user name="user1" href="https://www.bibsonomy.org/api/users/user1">
      <groups start="0" end="0"/>
    </user>
    <user name="user2" href="https://www.bibsonomy.org/api/users/user2">
      <groups start="0" end="0"/>
    </user>
  </users>
</bibsonomy>

{
  "users" : {
    "user" : [
      { "groups" : {"start":0, "end":0},"name":"user1","href":"https://www.bibsonomy.org/api/users/user1" },
      { "groups" : {"start":0, "end":0},"name":"user2","href":"https://www.bibsonomy.org/api/users/user2" }
    ],
    "start" : 0,
    "end" : 2,
    "next" : "https://www.bibsonomy.org/api/users?start=2&end=4"
  },
  "stat" : "ok"
}

<!--
  this type encapsulates a list of users
-->
<xsd:complexType name="UsersType">
  <xsd:sequence>
    <xsd:element maxOccurs="unbounded" minOccurs="0" name="user" type="UserType" />
  </xsd:sequence>
  <xsd:attribute name="start" type="positiveIntegerIncludingZero" use="required" />
  <xsd:attribute name="end" type="positiveIntegerIncludingZero" use="required" />
  <xsd:attribute name="next" type="xsd:anyURI" />
</xsd:complexType>

<!--
  a user
-->
<xsd:complexType name="UserType">
  <xsd:sequence>
    <xsd:element name="groups" type="GroupsType" minOccurs="0" maxOccurs="1"/>
  </xsd:sequence>
  <xsd:attribute name="name" type="xsd:string" use="required" />
  <xsd:attribute name="realname" type="xsd:string" />
  <xsd:attribute name="email" type="xsd:string" />
  <xsd:attribute name="homepage" type="xsd:string" />
  <xsd:attribute name="href" type="xsd:anyURI" />
</xsd:complexType>