IS:balise

balise
 

Schema description / Schemabeschreibung

Position of balise in the XML-Tree / Position von balise im XML-Baum

• Parent: <balises>
• Children: <additionalName> (introduced with version 2.1), <any>, <geoCoord>, <states>

Multiplicity / Anzahl

[1..1]

Semantics / Bedeutung

A <balise> defines a single balise and its attributes. A balise is an electronic beacon or transponder placed between the rails of a railway as part of an Automatic Train Protection (ATP) system. http://en.wikipedia.org/wiki/Balise (external link)

Attributes of balise / Attribute von balise

• id: XML-file-wide unique, machine-interpretable identity, required for later referencing that element internally. For a detailed explanation see Dev:identities.
  XML-Datei-weit eindeutige, maschineninterpretierbare Identität, die für die spätere interne Referenzierung dieses Elements erforderlich ist. Für eine detaillierte Erklärung siehe Dev:identities.

• code (introduced with version 2.1): This is a short string for typical, specific abbreviations, used in different systems with the same understanding.

• name: This is a short name for the current item.

• description: This is a more detailed description as addition to the short name. It shall allow a short overview or hints to the contents of this data set.

• xml:lang (introduced with version 2.1): This is a unique identifier of language. It uses basically the language standard IETF BCP 47 (external link) which may be different to ISO 639-1 (external link) or ISO 639-2 (external link). For mapping hints see relation to other standards (external link).
  This is used for defining name and description.

• pos: This is the position on a track defined as distance from its start (trackBegin) regardless the "absolute mileage" in @absPos.
  Das ist die Position des Elements auf einem Track i.S. der realen Entfernung zum trackBegin. Sie ist damit unabhängig von der mit absPos modellierten Strecken-Kilometrierung.

🗒️ For an explanation of the differences between @pos and @absPos see <mileageChange>

• absPos: This is the position on a track as absolute mileage/chainage.
  Das ist die Position des Elements im Referenzsystem der Strecken-Kilometrierung.

🗒️ For an explanation of the differences between @pos and @absPos see <mileageChange>

• absPosOffset (deprecated with version 2.1): The semantics of this attribute aren't very clear. It seems to be redundant to the definitions with mileageChanges in "overlapping regions".

• dir: This defines the validity of <balise> along the track. Possible values are:

• none: <balise> has no direction restriction.
• up: This denotes the direction from the <trackBegin> to the <trackEnd> (increasing relative position values).
• down: This goes opposite to up (decreasing relative position values).
• both: <balise> is valid in both directions.
• unknown: <balise> is restricted to a certain direction, but this direction is not known.

• countryID: This is the ID number for each country. It is used to determine to which country a balise belongs.

• groupID: balises and baliseGroups can be joined to groups. groupID is needed to determine if a balise belongs to a group and if yes, to which one.

• linkingAccuracy

• linkReactionAscending

• linkReactionDescending

• staticTelegram

• ndx

Syntactic Constraints / Syntaktische Beschränkungen

• id: xs:ID, required
  a string, starting with a letter (a..zA..Z) or an underscore (_),
  followed by a non-colonized and non-spaced string consisting of letters, digits, points (.), dashes (-) or underscores (_)
• code: xs:string, optional
• name: xs:string, optional
• description: xs:string, optional
• xml:lang: xs:language, language identification, optional

• pos: tLengthM (xs:decimal, 6 fraction digits, length value measured in meter); required; must be greater than or equal to zero, less than or equal to the track's length
  
• absPos: tLengthM (xs:decimal, 6 fraction digits, length value measured in meter); optional
  
• absPosOffset: xs:decimal, 6 fraction digits, length value measured in meter; optional

• dir: xs:string, generic type for more constrained direction statements: enumeration up, down, unknown; derived from tLaxDirection; optional
  

• countryID optional, up to 1023 countries

• groupID optional, up to 16383 groups

• linkingAccuracy optional

• linkReactionAscending optional

• linkReactionDescending optional

• staticTelegram xs:string, optional

• ndx optional

Best practice & Examples / Empfohlene Anwendung & Beispiele

Not yet described. / Noch nicht beschrieben.

Notes / Anmerkungen

Don't mix up groups of balises in the sense of baliseGroup with the groups defined by the groupIDs. A baliseGroup can also be part of a group of balise elements with a certain ID.

General information on positioning

Positive pos values describe the distance from the track's begin. The track length is derived from the pos value in <trackEnd>.

The absolute mileage refered to by absPos is usually found on technical drawings of the track layout or on mileage posts next to the track.

Open issues / Offene Punkte/Pendenzen

Not yet described. / Noch nicht beschrieben.