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This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79.
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The Location-to-Service Translation (LoST) protocol is an XML-based protocol for mapping service identifiers and geodetic or civic location information to service URIs and service boundaries. In particular, it can be used to determine the location-appropriate Public Safety Answering Point (PSAP) for emergency services.
The main data structure, the <mapping> element, used for encapsulating information about service boundaries is defined in the LoST protocol specification and circumscribes the region within which all locations map to the same service Uniform Resource Identifier (URI) or set of URIs for a given service.
This document defines an XML protocol to exchange these mappings between two nodes. This mechanism can be used for bulk exchange of <mapping> elements between two entities. As such, this document can also be used without the LoST protocol.
1.
Introduction
2.
Terminology
3.
Querying for Mappings with a <getMappingsRequest> / <getMappingsResponse> Exchange
3.1.
LoST Sync Client's Behavior
3.2.
LoST Sync Server's Behavior
3.3.
Examples
4.
Pushing Mappings via <pushMappings> and
<pushMappingsResponse>
4.1.
LoST Sync Client's Behavior
4.2.
LoST Sync Server's Behavior
4.3.
Example
5.
Transport
6.
RelaxNG
7.
Security Considerations
8.
IANA Considerations
8.1.
Content-type registration for 'application/lostsync+xml'
8.2.
LoST Sync Relax NG Schema Registration
8.3.
LoST Synchronization Namespace Registration
9.
Acknowledgments
10.
References
10.1.
Normative References
10.2.
Informative References
§
Authors' Addresses
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The LoST (Location-to-Service Translation) protocol (Hardie, T., Newton, A., Schulzrinne, H., and H. Tschofenig, “LoST: A Location-to-Service Translation Protocol,” August 2008.) [RFC5222] maps service identifiers and geodetic or civic location information to service URIs. The main data structure, the <mapping> element, used for encapsulating information about service boundaries is defined in the LoST protocol specification and circumscribes the region within which all locations map to the same service Uniform Resource Identifier (URI) or set of URIs for a given service.
This document enables a bulk exchange of <mapping> elements between two entities (the LoST Sync client and the LoST Sync server).
The LoST Sync mechanism can, for example, be used in the LoST architecture, as specified in the [I‑D.ietf‑ecrit‑mapping‑arch] (Schulzrinne, H., “Location-to-URL Mapping Architecture and Framework,” March 2009.). There, LoST servers act in different roles that cooperate to provide an ubiquitous, globally scalable and resilient mapping service. In the LoST mapping architecture, servers can peer, i.e., have an on-going data exchange relationship. Peering relationships are set up manually, based on local policies. A server can peer with any number of other servers. Forest guides peer with other forest guides; resolvers peer with forest guides and other resolvers (in the same cluster); authoritative mapping servers peer with forest guides and other authoritative servers, either in the same cluster or above or below them in the tree. Authoritative mapping servers push coverage regions "up" the tree, i.e., from child nodes to parent nodes. The child informs the parent of the geospatial or civic region that it covers for a specific service.
This document defines two types of exchanges and those are best described by the exchange between two nodes as shown in Figure 1 (Querying for Mappings with a <getMappingsRequest> Message) and Figure 2 (Pushing Mappings with a <pushMappingsRequest> Message). The protocol exchange always runs between a LoST Sync client and a LoST Sync server even through the roles are reversed for the two available exchanges and logically the two nodes might often be peers rather than in a client-server relationship. Node A in the example of Figure 1 (Querying for Mappings with a <getMappingsRequest> Message) and Figure 2 (Pushing Mappings with a <pushMappingsRequest> Message) has mappings that Node B is going to retrieve.
The <getMappingsRequest> and <getMappingsResponse> exchange allows a
LoST Sync client to request mappings from a LoST Sync server.
+---------+ +---------+
| Node B | | Node A |
| acting | | acting |
| as | | as |
| LoST | | LoST |
| Sync | | Sync |
| Client | | Server |
+---------+ +---------+
| |
| |
| |
| <getMappingsRequest> |
|----------------------------->|
| |
| <getMappingsResponse> |
|<-----------------------------|
| |
| |
| |
| Figure 1: Querying for Mappings with a <getMappingsRequest> Message |
The <pushMappingsRequest> and <pushMappingsResponse> exchange allows a
LoST Sync client to push mappings to LoST Sync server. The assumption is being made
that Node A and B have previously been configured in a way that they push mappings
in such a fashion and that Node A maintains state about the mappings that have to be
pushed to Node B. No subscribe mechanism is defined in this document that
would allow Node B to tell Node A about what mappings it is interested.
+---------+ +---------+
| Node A | | Node B |
| acting | | acting |
| as | | as |
| LoST | | LoST |
| Sync | | Sync |
| Client | | Server |
+---------+ +---------+
| |
| |
| |
| <pushMappingsRequest> |
|----------------------------->|
| |
| <pushMappingsResponse> |
|<-----------------------------|
| |
| |
| |
| Figure 2: Pushing Mappings with a <pushMappingsRequest> Message |
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119] (Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” March 1997.).
This document reuses terminology introduced by the mapping architecture document (Schulzrinne, H., “Location-to-URL Mapping Architecture and Framework,” March 2009.) [I‑D.ietf‑ecrit‑mapping‑arch].
Throughout this document we use the term LoST Sync client and LoST Sync server to denote the protocol end points of the exchange. The protocol is referred as LoST Sync within the text.
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A LoST Sync client has two ways to retrieve mapping elements from a LoST Sync server node.
In response to the <getMappingsRequest> message the client waits for the <getMappingsResponse> message. In case of a successful response the client stores the received mappings and determines which mappings to replace.
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When a LoST Sync server receives an empty <getMappingsRequest> message then all locally available mappings MUST be returned (assuming that the client has been properly authenticated and authorized).
When a LoST Sync server receives a <getMappingsRequest> message with one or multiple <exists> child element(s) then it MUST consult with the local mapping database to determine whether any of the mappings of the client is stale and whether there are mappings locally that the client does not yet have. The former can be determined by finding mappings corresponding to the 'source' and 'sourceID' attribut where a mapping with a more recent lastUpdated date exists.
Processing a <getMappingsRequest> message MAY lead to a successful response in the form of a <getMappingsResponse> or an <errors> message. Only the <badRequest>, <forbidden>, <internalError>, <serverTimeout> errors, defined in [RFC5222] (Hardie, T., Newton, A., Schulzrinne, H., and H. Tschofenig, “LoST: A Location-to-Service Translation Protocol,” August 2008.), are utilized by this specification. Neither the <redirect> nor the <warnings> messages are reused by this message.
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The first examples show the simplest <getMappingsRequest> message.
<?xml version="1.0" encoding="UTF-8"?> <getMappingsRequest xmlns="urn:ietf:params:xml:ns:lostsync1"/>
| Figure 3: Example of empty <getMappingsRequest> message |
An further example request is shown in Figure 4 (Example <getMappingsRequest> Message), the corresponding response in Figure 5 (Example <getMappingsResponse> Message). In this example a LoST node requests a specific mapping for source="authoritative.bar.example" and sourceId="7e3f40b098c711dbb6060800200c9a66" that is fresher than "2006-11-01T01:00:00Z".
<?xml version="1.0" encoding="UTF-8"?>
<getMappingsRequest xmlns="urn:ietf:params:xml:ns:lostsync1">
<exists>
<mapping-fingerprint source="authoritative.bar.example"
sourceId="7e3f40b098c711dbb6060800200c9a66"
lastUpdated="2006-11-01T01:00:00Z">
</mapping-fingerprint>
</exists>
</getMappingsRequest>
| Figure 4: Example <getMappingsRequest> Message |
The response is shown in Figure 5 (Example <getMappingsResponse> Message). A more recent mapping was available with the identification of source="authoritative.bar.example" and sourceId="7e3f40b098c711dbb6060800200c9a66". Only one mapping that matched source="authoritative.foo.example" was found and returned.
<?xml version="1.0" encoding="UTF-8"?>
<sync:getMappingsResponse
xmlns:sync="urn:ietf:params:xml:ns:lostsync1"
xmlns="urn:ietf:params:xml:ns:lost1"
xmlns:p2="http://www.opengis.net/gml">
<mapping source="authoritative.bar.example"
sourceId="7e3f40b098c711dbb6060800200c9a66"
lastUpdated="2008-11-26T01:00:00Z"
expires="2009-12-26T01:00:00Z">
<displayName xml:lang="en">
Leonia Police Department
</displayName>
<service>urn:service:sos.police</service>
<serviceBoundary
profile="urn:ietf:params:lost:location-profile:basic-civic">
<civicAddress
xmlns="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr">
<country>US</country>
<A1>NJ</A1>
<A3>Leonia</A3>
<PC>07605</PC>
</civicAddress>
</serviceBoundary>
<uri>sip:police@leonianj2.example.org</uri>
<serviceNumber>911</serviceNumber>
</mapping>
<mapping expires="2009-01-01T01:44:33Z"
lastUpdated="2008-11-01T01:00:00Z"
source="authoritative.foo.example"
sourceId="7e3f40b098c711dbb606011111111111">
<displayName xml:lang="en">
New York City Police Department
</displayName>
<service>urn:service:sos.police</service>
<serviceBoundary profile="geodetic-2d">
<p2:Polygon srsName="urn:ogc:def::crs:EPSG::4326">
<p2:exterior>
<p2:LinearRing>
<p2:pos>37.775 -122.4194</p2:pos>
<p2:pos>37.555 -122.4194</p2:pos>
<p2:pos>37.555 -122.4264</p2:pos>
<p2:pos>37.775 -122.4264</p2:pos>
<p2:pos>37.775 -122.4194</p2:pos>
</p2:LinearRing>
</p2:exterior>
</p2:Polygon>
</serviceBoundary>
<uri>sip:nypd@example.com</uri>
<uri>xmpp:nypd@example.com</uri>
<serviceNumber>911</serviceNumber>
</mapping>
</sync:getMappingsResponse>
| Figure 5: Example <getMappingsResponse> Message |
| TOC |
| TOC |
When a LoST Sync node obtains new information that is of interest to its peers, it MAY push the new mappings to its peers. Configuration settings at both peers decide whether this functionality is used. New mappings may arrive through non-LoST means, such as a manual addition to the local mappings database, or through the interaction with other LoST nodes. Mappings may also be deleted and this may trigger events.
A sending node keeps track with which recipient it has exchanged mapping elements with. As discussed in Section 5.1 of [RFC5222] (Hardie, T., Newton, A., Schulzrinne, H., and H. Tschofenig, “LoST: A Location-to-Service Translation Protocol,” August 2008.), mapping elements are identified by the 'source', 'sourceID' and 'lastUpdated' attributes. A mapping is considered the same if these three attributes match. It is RECOMMENDED not to push the same information to the same peer more than once.
A LoST Sync client MUST send a <pushMappings> request containing one or more <mapping> elements.
To delete a mapping, the content of the mapping is left empty. The node can delete the mapping from its internal mapping database, but has to remember which peers it has distributed this update to. The 'expires' attribute is required, but ignored. If an attempt is made to delete a non-existent mapping, the request is silently ignored.
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When a LoST Sync Server receives a <pushMappingsRequest> message then a newly received mapping M' MUST replace an existing mapping M if all of the following conditions hold:
If the received mapping M' does not update any existing mapping M then it MUST be added to the local cache as an independent mapping.
If a <pushMappingsRequest> message with an empty <mapping> element is received then a corresponding mapping has to be determined based on the 'source', 'sourceID' and 'lastUpdated' attributes. If a mapping has been found then it MUST be deleted. If no mapping can be identified then an <errors> response MUST be returned that contains the <notDeleted> child element. The <notDeleted> element MAY carry a <message> element and MUST contain the <mapping> element(s) that caused the error.
The response to a <pushMappingsRequest> request is a <pushMappingsResponse> message. With this specification, a successful response message returns no additional elements, whereas an <errors> response is returned in the response message, if the request failed. Only the <badRequest>, <forbidden>, <internalError> or <serverTimeout> errors defined in Section 13.1 of [RFC5222] (Hardie, T., Newton, A., Schulzrinne, H., and H. Tschofenig, “LoST: A Location-to-Service Translation Protocol,” August 2008.), are used. The <redirect> and <warnings> messages are not used for this query/response.
If the set of nodes that are synchronizing their data does not form a tree, it is possible that the same information arrives through several other nodes. This is unavoidable, but generally only imposes a modest overhead. (It would be possible to create a spanning tree in the same fashion as IP multicast, but the complexity does not seem warranted, given the relatively low volume of data.)
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An example is shown in Figure 6 (Example <pushMappingsRequest> Message). Image a LoST node that obtained two new mappings identified as follows:
These two mappings have to be added to the peer's mapping database.
Additionally, the following mapping has to be deleted:
<?xml version="1.0" encoding="UTF-8"?>
<sync:pushMappingsRequest
xmlns:sync="urn:ietf:params:xml:ns:lostsync1"
xmlns="urn:ietf:params:xml:ns:lost1"
xmlns:p2="http://www.opengis.net/gml">
<mapping source="authoritative.example"
sourceId="7e3f40b098c711dbb6060800200c9a66"
lastUpdated="2008-11-26T01:00:00Z"
expires="2009-12-26T01:00:00Z">
<displayName xml:lang="en">
Leonia Police Department
</displayName>
<service>urn:service:sos.police</service>
<serviceBoundary
profile="urn:ietf:params:lost:location-profile:basic-civic">
<civicAddress
xmlns="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr">
<country>US</country>
<A1>NJ</A1>
<A3>Leonia</A3>
<PC>07605</PC>
</civicAddress>
</serviceBoundary>
<uri>sip:police@leonianj.example.org</uri>
<serviceNumber>911</serviceNumber>
</mapping>
<mapping expires="2009-01-01T01:44:33Z"
lastUpdated="2008-11-01T01:00:00Z"
source="authoritative.example"
sourceId="7e3f40b098c711dbb606011111111111">
<displayName xml:lang="en">
New York City Police Department
</displayName>
<service>urn:service:sos.police</service>
<serviceBoundary profile="geodetic-2d">
<p2:Polygon srsName="urn:ogc:def::crs:EPSG::4326">
<p2:exterior>
<p2:LinearRing>
<p2:pos>37.775 -122.4194</p2:pos>
<p2:pos>37.555 -122.4194</p2:pos>
<p2:pos>37.555 -122.4264</p2:pos>
<p2:pos>37.775 -122.4264</p2:pos>
<p2:pos>37.775 -122.4194</p2:pos>
</p2:LinearRing>
</p2:exterior>
</p2:Polygon>
</serviceBoundary>
<uri>sip:nypd@example.com</uri>
<uri>xmpp:nypd@example.com</uri>
<serviceNumber>911</serviceNumber>
</mapping>
<mapping source="nj.us.example"
sourceId="123"
lastUpdated="2008-11-01T01:00:00Z"
expires="2008-11-01T01:00:00Z"/>
</sync:pushMappingsRequest>
| Figure 6: Example <pushMappingsRequest> Message |
In response, the peer performs the necessary operation and updates its mapping database. In particular, it will check whether the other peer is authorized to perform the update and whether the elements and attributes contain values that it understands. In our example, a positive response is returned as shown in Figure 7 (Example <pushMappingsResponse>).
<?xml version="1.0" encoding="UTF-8"?> <pushMappingsResponse xmlns="urn:ietf:params:xml:ns:lostsync1" />
| Figure 7: Example <pushMappingsResponse> |
In case that a mapping could not be deleted as requested the following error
response might be returned instead.
<?xml version="1.0" encoding="UTF-8"?>
<errors xmlns="urn:ietf:params:xml:ns:lost1"
xmlns:sync="urn:ietf:params:xml:ns:lostsync1"
source="nodeA.example.com">
<sync:notDeleted
message="Could not delete the indicated mapping."
xml:lang="en">
<mapping source="nj.us.example"
sourceId="123"
lastUpdated="2008-11-01T01:00:00Z"
expires="2008-11-01T01:00:00Z"/>
</sync:notDeleted>
</errors>
| Figure 8: Example <errors> Message |
| TOC |
LoST Sync needs an underlying protocol transport mechanism to carry requests and responses. This document defines the use of LoST Sync over HTTP and LoST over HTTP-over-TLS. Client and server developers are reminded that full support of RFC 2616 HTTP facilities is expected. If LoST Sync clients or servers re-implement HTTP, rather than using available servers or client code as a base, careful attention must be paid to full interoperability. Other transport mechanisms are left to future documents. The available transport mechanisms are determined through the use of the LoST U-NAPTR application. In protocols that support content type indication, LoST Sync uses the media type application/lostsync+xml.
When using HTTP [RFC2616] (Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., and T. Berners-Lee, “Hypertext Transfer Protocol -- HTTP/1.1,” June 1999.) and HTTP-over-TLS [RFC2818] (Rescorla, E., “HTTP Over TLS,” May 2000.), LoST Sync messages use the HTTP POST method. The HTTP request MUST use the Cache-Control response directive "no-cache" to HTTP-level caching even by caches that have been configured to return stale responses to client requests.
All LoST Sync responses, including those indicating a LoST warning or error, are carried in 2xx responses, typically 200 (OK). Other 2xx responses, in particular 203 (Non-authoritative information) may be returned by HTTP caches that disregard the caching instructions. 3xx, 4xx and 5xx HTTP response codes indicates that the HTTP request itself failed or was redirected; these responses do not contain any LoST Sync XML elements.
The HTTP URL is derived from the LoST Sync server name via U-NAPTR application.
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<?xml version="1.0" encoding="utf-8"?>
<grammar ns="urn:ietf:params:xml:ns:lostsync1"
xmlns="http://relaxng.org/ns/structure/1.0"
xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
<include href="lost.rng"/>
<start combine="choice">
<a:documentation> Location-to-Service Translation (LoST)
Synchronization Protocol</a:documentation>
<choice>
<ref name="pushMappings"/>
<ref name="pushMappingsResponse"/>
<ref name="getMappingsRequest"/>
<ref name="getMappingsResponse"/>
</choice>
</start>
<define name="pushMappings">
<element name="pushMappings">
<oneOrMore>
<ref name="mapping"/>
</oneOrMore>
<ref name="extensionPoint"/>
</element>
</define>
<define name="pushMappingsResponse">
<element name="pushMappingsResponse">
<ref name="extensionPoint"/>
</element>
</define>
<define name="getMappingsRequest">
<element name="getMappingsRequest">
<choice>
<ref name="exists"></ref>
<ref name="extensionPoint"/>
</choice>
</element>
</define>
<define name="exists">
<element name="exists">
<oneOrMore>
<element name="mapping-fingerprint">
<attribute name="source">
<data type="token"/>
</attribute>
<attribute name="sourceId">
<data type="token"/>
</attribute>
<attribute name="lastUpdated">
<data type="dateTime"/>
</attribute>
<ref name="extensionPoint"/>
</element>
</oneOrMore>
</element>
</define>
<define name="getMappingsResponse">
<element name="getMappingsResponse">
<oneOrMore>
<ref name="mapping"/>
</oneOrMore>
<ref name="extensionPoint"/>
</element>
</define>
<!-- error messages -->
<define name="notDeleted">
<element name="notDeleted">
<ref name="basicException"/>
<oneOrMore>
<ref name="mapping"/>
</oneOrMore>
</element>
</define>
</grammar>
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The LoST security considerations are discussed in [RFC5222] (Hardie, T., Newton, A., Schulzrinne, H., and H. Tschofenig, “LoST: A Location-to-Service Translation Protocol,” August 2008.). The operations described in this document involve mutually-trusting LoST nodes. These nodes need to authenticate each other, using mechanisms such as HTTP Digest (Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S., Leach, P., Luotonen, A., and L. Stewart, “HTTP Authentication: Basic and Digest Access Authentication,” June 1999.) [RFC2617], HTTP Basic (Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S., Leach, P., Luotonen, A., and L. Stewart, “HTTP Authentication: Basic and Digest Access Authentication,” June 1999.) [RFC2617] over TLS (Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.) [RFC5246] or TLS client and server certificates.
| TOC |
| TOC |
This specification requests the registration of a new MIME type according to the procedures of RFC 4288 [RFC4288] (Freed, N. and J. Klensin, “Media Type Specifications and Registration Procedures,” December 2005.) and guidelines in RFC 3023 [RFC3023] (Murata, M., St. Laurent, S., and D. Kohn, “XML Media Types,” January 2001.).
- MIME media type name:
- application
- MIME subtype name:
- lostsync+xml
- Mandatory parameters:
- none
- Optional parameters:
- charset
Indicates the character encoding of enclosed XML.
- Encoding considerations:
- Uses XML, which can employ 8-bit characters, depending on the character encoding used. See RFC 3023 [RFC3023] (Murata, M., St. Laurent, S., and D. Kohn, “XML Media Types,” January 2001.), Section 3.2.
- Security considerations:
- This content type is designed to carry LoST Syncronization protocol payloads.
- Interoperability considerations:
- None
- Published specification:
- RFCXXXX [NOTE TO IANA/RFC-EDITOR: Please replace XXXX with the RFC number of this specification.]
- Applications which use this media type:
- Emergency and Location-based Systems
- Additional information:
- Magic Number:
- None
- File Extension:
- .lostsyncxml
- Macintosh file type code:
- 'TEXT'
- Personal and email address for further information:
- Hannes Tschofenig, Hannes.Tschofenig@nsn.com
- Intended usage:
- LIMITED USE
- Author:
This specification is a work item of the IETF ECRIT working group, with mailing list address <ecrit@ietf.org>.
- Change controller:
The IESG <iesg@ietf.org>
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- URI:
- urn:ietf:params:xml:schema:lostsync1
- Registrant Contact:
- IETF ECRIT Working Group, Hannes Tschofenig (Hannes.Tschofenig@gmx.net).
- Relax NG Schema:
- The Relax NG schema to be registered is contained in Section 6 (RelaxNG).
| TOC |
- URI:
- urn:ietf:params:xml:ns:lostsync1
- Registrant Contact:
- IETF ECRIT Working Group, Hannes Tschofenig (Hannes.Tschofenig@gmx.net).
- XML:
BEGIN <?xml version="1.0"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html;charset=iso-8859-1"/> <title>LoST Synchronization Namespace</title> </head> <body> <h1>Namespace for LoST server synchronization</h1> <h2>urn:ietf:params:xml:ns:lost1:sync</h2> <p>See <a href="[URL of published RFC]">RFCXXXX [NOTE TO IANA/RFC-EDITOR: Please replace XXXX with the RFC number of this specification.]</a>.</p> </body> </html> END
| TOC |
Robins George, Cullen Jennings, Karl Heinz Wolf, Richard Barnes, Mayutan Arumaithurai and Andrew Newton provided helpful input. Jari Urpalainen assisted with the Relax NG schema. We would also like to thank our PROTO shepherd Roger Marshall for his help with the document.
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| TOC |
| TOC |
| [I-D.ietf-ecrit-mapping-arch] | Schulzrinne, H., “Location-to-URL Mapping Architecture and Framework,” draft-ietf-ecrit-mapping-arch-04 (work in progress), March 2009 (TXT). |
| TOC |
| Henning Schulzrinne | |
| Columbia University | |
| Department of Computer Science | |
| 450 Computer Science Building | |
| New York, NY 10027 | |
| US | |
| Phone: | +1 212 939 7004 |
| Email: | hgs+ecrit@cs.columbia.edu |
| URI: | http://www.cs.columbia.edu |
| Hannes Tschofenig | |
| Nokia Siemens Networks | |
| Linnoitustie 6 | |
| Espoo 02600 | |
| Finland | |
| Phone: | +358 (50) 4871445 |
| Email: | Hannes.Tschofenig@gmx.net |
| URI: | http://www.tschofenig.priv.at |