I want to select the next sibling of an attribute for outputting the period. 
This template is selecting the required attributes.

The only solution that works is the one where i match the name of the attribute and selecting the one i need. How can i make it more general, using few line?
I've tried with 'following-sibling' but that works just for elements.

The piece of the functional code; 

```
             ...
                <Period >
                    <xsl:attribute name="Unit">
                        <xsl:choose>
                            <xsl:when test="local-name()='BonusAmount'">
                                <xsl:value-of select="../@BonusFrequency"/>
                            </xsl:when>
                            <xsl:when test="local-name()='CommissionAmount'">
                                <xsl:value-of select="../@CommissionFrequency"/>
                            </xsl:when>
                            <xsl:when test="local-name()='GrossRegularOvertimeAmount'">
                                <xsl:value-of select="../@GrossRegularOvertimeFrequency"/>
                            </xsl:when>
                            <xsl:when test="local-name()='GrossSalaryAmount'">
                                <xsl:value-of select="../@GrossSalaryFrequency"/>
                            </xsl:when>
                            <xsl:when test="local-name()='CarAllowanceAmount'">
                                <xsl:value-of select="../@CarAllowanceFrequency"/>
                            </xsl:when>
                            <xsl:when test="local-name()='WorkAllowanceAmount'">
                                <xsl:value-of select="../@WorkAllowanceFrequency"/>
                            </xsl:when>
                            <xsl:when test="local-name()='WorkersCompensationAmount'">
                                <xsl:value-of select="../@WorkersCompensationFrequency"/>
                            </xsl:when>

                        </xsl:choose>
                    </xsl:attribute>
                </Period>
           ...

```

XML sample:

```
 <Employment>
      <PAYG Basis="Temporary" Industry="Oil and Gas Extraction" IndustryCode="0700" Occupation="General Waiter" OccupationCode="6323-11" OnProbation="Yes" ProbationDateEnds="2019-03-27" StartDate="2014-05-05" Status="Secondary" UniqueID="c8492d8c-34fc-419b-93f4-f1f3" x_Employer="c46c9077-31ef-4daa-b8cc-c9e3">
        <Income BonusAmount="89898985" BonusFrequency="Monthly" CommissionAmount="4488" CommissionFrequency="Yearly" GrossRegularOvertimeAmount="365" GrossRegularOvertimeFrequency="Fortnightly" GrossSalaryAmount="4798" GrossSalaryFrequency="Weekly"  WorkAllowanceAmount="10101010" WorkAllowanceFrequency="Monthly"/>
      </PAYG>
    </Employment>

```

The output:

```
<ValueItem Value="89898985">
        <Identifier UniqueID="c8492d8c-34fc-419b-93f4-f1f3-Income-PAYG-BonusAmount"/>
        <PercentOwned Percent="100">
           <RelatedEntityRef RelatedID="baaef85e-3793-4fe8-8c62-8cc766fa490b"/>
        </PercentOwned>
        <Income Type="Bonus">
           <Period Unit="Monthly"/>
           <RelatedEntityRef RelatedID="c46c9077-31ef-4daa-b8cc-c9e3"/>
        </Income>
     </ValueItem>
     <ValueItem Value="4488">
        <Identifier UniqueID="c8492d8c-34fc-419b-93f4-f1f3-Income-PAYG-CommissionAmount"/>
        <PercentOwned Percent="100">
           <RelatedEntityRef RelatedID="baaef85e-3793-4fe8-8c62-8cc766fa490b"/>
        </PercentOwned>
        <Income Type="Commission">
           <Period Unit="Yearly"/>
           <RelatedEntityRef RelatedID="c46c9077-31ef-4daa-b8cc-c9e3"/>
        </Income>
     </ValueItem>
     <ValueItem Value="365">
        <Identifier UniqueID="c8492d8c-34fc-419b-93f4-f1f3-Income-PAYG-GrossRegularOvertimeAmount"/>
        <PercentOwned Percent="100">
           <RelatedEntityRef RelatedID="baaef85e-3793-4fe8-8c62-8cc766fa490b"/>
        </PercentOwned>
        <Income Type="GrossRegularOvertime">
           <Period Unit="Fortnightly"/>
           <RelatedEntityRef RelatedID="c46c9077-31ef-4daa-b8cc-c9e3"/>
        </Income>
     </ValueItem>
     <ValueItem Value="4798">
        <Identifier UniqueID="c8492d8c-34fc-419b-93f4-f1f3-Income-PAYG-GrossSalaryAmount"/>
        <PercentOwned Percent="100">
           <RelatedEntityRef RelatedID="baaef85e-3793-4fe8-8c62-8cc766fa490b"/>
        </PercentOwned>
        <Income Type="GrossSalary">
           <Period Unit="Weekly"/>
           <RelatedEntityRef RelatedID="c46c9077-31ef-4daa-b8cc-c9e3"/>
        </Income>
     </ValueItem>

```

etc.