Add RailwayLocation Kilometer for OperationalPoints to the mappings

[stefanbischof]

In the RINF XML the OperationalPoint element contains a OPRailwayLocation element with a Kilometer attribute. For example:

<OperationalPoint ValidityDateStart="2020-03-15" ValidityDateEnd="2099-12-31">
  <OPName Value="Feldkirch-Amberg" />
  <UniqueOPID Value="ATFk H1     " />
  <OPTafTapCode IsApplicable="Y" Value="AT02321" />
  <OPType Value="70" OptionalValue="passenger stop" />
  <OPGeographicLocation Longitude="+9,6216551" Latitude="47,2557051" />
  <OPRailwayLocation Kilometer="44,855" NationalIdentNum="10105" />

Currently this Kilometer location is absent from the extracted data but would be important to know.

[julianrojas87]

In v1.2.0 we have added new mapping rules to include the kilometer point of Operational Points. This is an example of how is this data modelled in the Knowledge Graph:

<#OP_1> a era:OperationalPoint ;
    era:lineReference <#LR_55_34.67>, <#LR_27_3.4> .

<#LR_55_34.67> a era:LineReference ;
    era:lineNationalId <#LNI_55> ;
    era:kilometer 34.67^^xsd:double .

<#LR_27_3.4> a era:LineReference ;
    era:lineNationalId <#LNI_27> ;
    era:kilometer 3.4^^xsd:double .