This file is indexed.

/usr/share/games/enigma/schemas/index.xsd is in enigma-data 1.20-dfsg.1-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' version="0.2" xml:lang="en">
  <xs:annotation>
    <xs:documentation>
      XML schema definitions for Enigma levelpack index
      Copyright © 2006 Ronald Lamprecht
      GPL2
    </xs:documentation>
  </xs:annotation>
  <xs:element name="index">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="info" minOccurs="1" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Description of the index:
              title    - identifying title of the levelpack
              group    - default levelpack group
              owner    - user name of levelpack creator - "system" for distributed packs
              release  - compatibility version number of levelpack
              revision - modification version number of levelpack
              location - default sorting position of levelpack within a group
              network  - true if levelpack is built for 2-player network game, false for standard single user game
              enigma   - compatibility required Enigma release version.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:attribute name="title" type="xs:string" use="required"/>
            <xs:attribute name="group" type="xs:string" use="required"/>
            <xs:attribute name="owner" type="xs:string" use="required"/>
            <xs:attribute name="release" type="xs:positiveInteger" use="required"/>
            <xs:attribute name="revision" type="xs:positiveInteger" use="required"/>
            <xs:attribute name="location" type="xs:float" use="required"/>
            <xs:attribute name="network" type="xs:boolean" use="required"/>
            <xs:attribute name="enigma" type="xs:float" use="required"/>
          </xs:complexType>
        </xs:element> <!-- info -->

        <xs:element name="update" minOccurs="0" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Url's needed for updates:
              indexurl  - url to obtain updates of the index itself
              levelurl  - url base to download new levels.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:attribute name="indexurl" type="xs:anyURI" use="required"/>
            <xs:attribute name="levelurl" type="xs:anyURI" use="required"/>
          </xs:complexType>
        </xs:element> <!-- update -->
        
        <xs:element name="attributes" minOccurs="1" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              A dictionary for future additions. These attributes will be readable
              by future Lua index extensions.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="property" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                  <xs:documentation>
                    All simple key-value-properties.
                  </xs:documentation>
                </xs:annotation>
                <xs:complexType>
                  <xs:attribute name="key" type="xs:string" use="required"/>
                  <xs:attribute name="value" type="xs:string" use="required"/>
                </xs:complexType>
              </xs:element> <!-- property -->
            </xs:sequence>
          </xs:complexType>
        </xs:element> <!-- attributes -->

        <xs:element name="lua" minOccurs="0" maxOccurs="1">
          <xs:annotation>
            <xs:documentation>
              Future Lua index extension. Per levelpack control of level menu
              display, levelpack scoring etc..
              Possible elements are: luamain-CDATA, i18n
              Possible attributes are: libpath
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:any namespace="##targetNamespace" minOccurs="0" maxOccurs="unbounded" processContents="skip"/>
            </xs:sequence>
            <xs:anyAttribute namespace="##targetNamespace" processContents="skip"/>
          </xs:complexType>
        </xs:element> <!-- lua -->
        
        <xs:element name="levels" minOccurs="1" maxOccurs="1" >
          <xs:annotation>
            <xs:documentation>
              The sequence of the level elements is the sequence of levels in the pack.
            </xs:documentation>
          </xs:annotation>
          <xs:complexType>
            <xs:sequence>
              <xs:element name="level" minOccurs="0" maxOccurs="unbounded" >
                <xs:annotation>
                  <xs:documentation>
                    The attributes either identify a level, are cached from the level
                    metadata to avoid unnecessary level loads or describe variation from
                    the level default. See the level description in the reference manual
                    for more information on the single attributes:
                    _seq    - an auto generated counter just for human readability that will never be used
                    _title  - cached level title
                    _xpath  - identifying relative path, url or normed oxyd identifier of the level
                    id      - identifying level id
                    author  - cached level author name
                    score   - cached score version of level
                    rel     - identifying release version of level
                    rev     - identifying revision version of level that announces level updates
                    easy    - cached has easy mode level flag
                    ctrl    - variation in control of level default
                    unit    - variation in score unit of level default
                    target  - variation in score target of level default
                    Attributes with leading underscore are just named this way to generate human
                    readable indices. Future attribute additions are transparent to Enigma 1.0 -
                    they will be ignored but are maintained on all index modifications.
                  </xs:documentation>
                </xs:annotation>
                <xs:complexType>
                  <xs:attribute name="_seq" type="xs:positiveInteger" use="optional"/>
                  <xs:attribute name="_title" type="xs:string" use="required"/>
                  <xs:attribute name="_xpath" type="xs:string" use="required"/>
                  <xs:attribute name="id" type="xs:string" use="required"/>
                  <xs:attribute name="author" type="xs:string" use="required"/>
                  <xs:attribute name="score" type="xs:positiveInteger" use="required"/>
                  <xs:attribute name="rel" type="xs:positiveInteger" use="required"/>
                  <xs:attribute name="rev" type="xs:unsignedShort" use="required"/>
                  <xs:attribute name="easy" type="xs:boolean" use="required"/>
                  <xs:attribute name="ctrl" type="controlType" use="required"/>
                  <xs:attribute name="unit" type="scoreunitType" use="required"/>
                  <xs:attribute name="target" type="xs:string" use="required"/>
                  <xs:anyAttribute namespace="##targetNamespace" processContents="skip"/>
                </xs:complexType>
              </xs:element> <!-- level -->
            </xs:sequence>
          </xs:complexType>
        </xs:element> <!-- levels -->
        <xs:any namespace="##targetNamespace" minOccurs="0" maxOccurs="unbounded" processContents="skip"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element> <!-- index -->

  <xs:simpleType name="controlType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="force"/>
      <xs:enumeration value="balance"/>
      <xs:enumeration value="key"/>
      <xs:enumeration value="other"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="scoreunitType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="duration"/>
      <xs:enumeration value="number"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>