Regex flavour in IP-XACT Schema

[AmeyaVS]

Hello,

I have a query regarding the regex flavor specified in the XML Schema: 'simpleTypes.xsd'

<xs:simpleType name="portName">
  <xs:annotation>
    <xs:documentation>A type for a port name string, allows letters, digits, dash, colon, underscore and period</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:whiteSpace value="collapse"/>
    <xs:pattern value="\i[\p{L}\p{N}\.\-:_]*"/>  <!-- Which regex flavour is being used here for specification? -->
  </xs:restriction>
</xs:simpleType>

Can anyone elaborate on the XML schema specification specifically the attribute for the element pattern and attribute: value?

This regex pattern is available in IP-XACT 2014, and IP-XACT 2022 simpleTypes.xsd.

 

Regards,

Ameya Vikram Singh

[kock]

Hi,

I believe the regex used is specified here: https://www.w3.org/TR/xmlschema-2/#dt-regex

Best regards,
Erwin

[AmeyaVS]

Hello @kock,

While reviewing the reference shared by you:

https://www.w3.org/TR/xmlschema-2/#dt-regex

Found another reference, and it seems the regular expression syntax used has been deprecated by the standard body:

https://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Letter

Which has been updated to follow the EBNF notation.

As per the section 6 mentioned here:

https://www.w3.org/TR/xml/

or

https://www.w3.org/TR/xml/#sec-notation

It seems the newer revisions of IP-XACT specifications have not been updated to reflect the same as per the base XML specifications.

Regards,

Ameya