OSI Selectors, what are their values? C++

Question

I'm working with IEC61850 standard. And at first time I faced OSI Selectors: Transport selector, Session selector and Presentation selector. I'm not interested in their physical meaning. The task is to convert their values from parsing file (from std::string) into uint8_t. I don't understand how are these values presented?

The values from file(xml schema):

<P type="OSI-PSEL">00000001</P>
<P type="OSI-SSEL">0001</P>
<P type="OSI-TSEL">0001</P>

or it can be

<P type="OSI-TSEL">00000001</P>
<P type="OSI-PSEL">01</P>
<P type="OSI-SSEL">01</P>

in xsd I got this infromation about them:

<xs:complexType name="tP_OSI-TSEL">
     <xs:restriction base="tP">
     <xs:maxLength value="8"/>
     <xs:pattern value="[0-9,A-F]+"/>
     </xs:restriction>
</xs:complexType>
<xs:complexType name="tP_OSI-SSEL">
     <xs:restriction base="tP">
     <xs:maxLength value="16"/>
     <xs:pattern value="[0-9,A-F]+"/>
     </xs:restriction>
</xs:complexType>
<xs:complexType name="tP_OSI-PSEL">
     <xs:restriction base="tP">
     <xs:maxLength value="16"/>
     <xs:pattern value="[0-9,A-F]+"/>
     </xs:restriction>
</xs:complexType>

Are 01 or 00001 or 00000001 etc represented in binary number system? Why do they have different length? I mean if 00000001 is an octet, what is 00001 and 01 then?

OSI Selectors, what are their values? C++

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