XSLT: How to select attribute of element, based on that element has not other attribute?

Question

I want to select attribute of element but I know that he hasn´t other different attribute. For clarification, if element hasn´t attribute "receive Event" I want to select attribute xmi:id.

This is my xml input:


    <packagedElement xmi:type="uml:Package" xmi:id="EAPK_2A526457_CD3B_48f1_8A97_63CD2A91C147" name="loopSequence" visibility="public">
                <packagedElement xmi:type="uml:Collaboration" xmi:id="EAID_CB000000_457_CD3B_48f1_8A97_63CD2A91C14" name="EA_Collaboration1" visibility="public">
                    <ownedBehavior xmi:type="uml:Interaction" xmi:id="EAID_IN000000_457_CD3B_48f1_8A97_63CD2A91C14" name="EA_Interaction1" visibility="public">
                        <message xmi:type="uml:Message" xmi:id="EAID_A42D4D8F_EFB6_4b4e_A861_1FEE1946B30D" name="selectDrivingSchool" messageKind="found" messageSort="synchCall" receiveEvent="EAID_FR000000_F30E_4171_884F_3A3DFE7EB88F"/>
                        <message xmi:type="uml:Message" xmi:id="EAID_67E4B669_8E61_4571_AD23_245CC7F62F4C" name="getCourse" messageKind="complete" messageSort="synchCall" sendEvent="EAID_FR000001_F30E_4171_884F_3A3DFE7EB88F" receiveEvent="EAID_FR000001_07E9_42c1_AFDB_1285EC859B12"/>
                        <message xmi:type="uml:Message" xmi:id="EAID_4B784479_1F3B_425c_A286_B5F0D75E1832" name="selectCourse" messageKind="complete" messageSort="synchCall" sendEvent="EAID_FR000000_07E9_42c1_AFDB_1285EC859B12" receiveEvent="EAID_FR000001_7564_47cf_9C22_DF3A6E7302AD"/>
                        <message xmi:type="uml:Message" xmi:id="EAID_6C98A08D_1BD1_42bf_9662_59F6FE2E4442" name="end" messageKind="lost" messageSort="synchCall" sendEvent="EAID_FR000000_7564_47cf_9C22_DF3A6E7302AD"/>
                    </ownedBehavior>
                </packagedElement>
                <packagedElement xmi:type="uml:Class" xmi:id="EAID_B6F68D66_8F02_4d02_91B5_2BD7B1742A51" name="Activity Final" visibility="public"/>
                <packagedElement xmi:type="uml:Class" xmi:id="EAID_CAFE5DAF_4C2B_47e5_8704_B4A5D3528513" name="Activity Initial" visibility="public"/>
    </packagedElement>

This is my XSLT code:

 <xsl:template  match="packagedElement[@xmi:type='uml:Class' and @name='ActivityFinal' or @name='Activity Final']">
        <node xmi:type="uml:ActivityFinalNode" xmi:id= "EAID_ACTIVITY{substring(@xmi:id,14,28)}" name="{@name}" visibility="{@visibility}">
            <incoming xmi:idref=""/>
        </node>
 </xsl:template>

And output XML should like that:

<node xmi:type="uml:ActivityFinalNode" xmi:id="EAID_ACTIVITY_8F02_4d02_91B5_2BD7B1742A51" name="Activity Final" visibility="public">
    <incoming xmi:idref="EAID_6C98A08D_1BD1_42bf_9662_59F6FE2E4442"/>
</node>

So I need to get xmi:id of the 4th message which has not attribute "receiveEvent". Maybe I should use xsl:key, but with match messages???

Tomalak Tomalak · Accepted Answer · 2019-04-13T10:15:10

The not() function can do that. Wrapped for legibility:

<xsl:template match="packagedElement[
    @xmi:type='uml:Class' 
    and (
        @name='ActivityFinal'
        or @name='Activity Final'
    )
]">
    <node
        xmi:type="uml:ActivityFinalNode"
        xmi:id="EAID_ACTIVITY{substring(@xmi:id, 14, 28)}"
        name="{@name}"
        visibility="{@visibility}"
    >
        <incoming xmi:idref="{.//message[not(@receiveEvent)]/@xmi:id}" />
    </node>
</xsl:template>

Notes:

this will output the xmi:id of the first <message> that has no receiveEvent attribute. If multiple such messages can exist, you need to define the behavior or the template accordingly.
It's better to put parenthesis around the or part of your match expression.

XSLT: How to select attribute of element, based on that element has not other attribute?

1 Answers