IS:balise

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balise
 


Schema description / Schemabeschreibung

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

Multiplicity / Anzahl

[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. [1]

Attributes of balise / Attribute von balise

  • 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: 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 margin error between balise
  • linkReactionAscending Reaction to be performed if a linking or a balise group message consistency problem occurs with the balise group linked to in ascendig direction [2]
  • linkReactionDescending Reaction to be performed if a linking or a balise group message consistency problem occurs with the balise group linked to in descendig direction[2]
  • staticTelegram: the telegram coded to the balise; representation of the binary telegram shall be a hex string
  • ndx Position of the balise inside of the group [3]

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 direction statements: enumeration up, down, unknown, none, both; optional
  • countryID optional, up to 1023 countries
  • groupID optional, up to 16383 groups
  • linkingAccuracy optional
  • linkReactionAscending optional
  • linkReactionDescending optional
  • staticTelegram xs:string with further constraints to allow only HEX string patterns [0-9a-fA-F]*, optional —(introduced with version 2.4): an arbitrary string consisting of hex digits from 0 to 9, a to f; not allowing white space, letters; no length restriction
  • 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.

Reference