Limitations for attribute specialization

Dear honourable DITA committee,

Iâve added a new attribute (type) to a specialized element. This attribute is not specialized, itâs just added as shown below. My question now is: âIs this allowed?â I mean, technically this is no problem and this can be processed with the DITA-OT and the PDF2 plugin (and others). Iâve read these sections: Overview of specialization, Specialization rules for attributes, RELAX NG: Coding requirements for attribute domain modules

I could not find a statement saying something like âIf you add an attribute, it must be added as a âspecializedâ attributeâ. Do I violate the specification and should I feel bad?

<define name="tv.attributes">
    <ref name="univ-atts-translate-no"/>
    <optional>
        <attribute name="name" a:defaultValue="tv"/>
    </optional>
    <optional>
        <attribute name="datatype"/>
    </optional>
    <optional>
        <attribute name="value"/>
    </optional>
    <optional>
        <attribute name="href"/>
    </optional>
    <optional>
        <attribute name="keyref"/>
    </optional>
    <optional>
        <attribute name="format"/>
    </optional>
    <attribute name="type">
        <choice>
            <value>A</value><a:documentation>Ampere</a:documentation>
            <value>Ah</value><a:documentation>Ampere hour</a:documentation>
            <value>Bq</value><a:documentation>Becquerel</a:documentation>
            <value>F</value><a:documentation>Farad</a:documentation>
            <value>Gy</value><a:documentation>Gray</a:documentation>
            <value>H</value><a:documentation>Henry</a:documentation>
            <value>Hz</value><a:documentation>Hertz</a:documentation>
            <value>J</value><a:documentation>Joule</a:documentation>
            <value>K</value><a:documentation>Kelvin</a:documentation>
            <value>L</value><a:documentation>Liter</a:documentation>
            <value>N</value><a:documentation>Newton</a:documentation>
            <value>Pa</value><a:documentation>Pascal</a:documentation>
            <value>S</value><a:documentation>Siemens</a:documentation>
            <value>Sv</value><a:documentation>Sievert</a:documentation>
            <value>T</value><a:documentation>Tesla</a:documentation>
            <value>V</value><a:documentation>Volt</a:documentation>
            <value>W</value><a:documentation>Watt</a:documentation>
            <value>Wb</value><a:documentation>Weber</a:documentation>
            <value>bar</value><a:documentation>Bar</a:documentation>
            <value>cd</value><a:documentation>Candela</a:documentation>
            <value>cm</value><a:documentation>Centimeter</a:documentation>
            <value>cmÂ</value><a:documentation>Square Centimeter</a:documentation>
            <value>dB(A)</value><a:documentation>A-weighted decibels</a:documentation>
            <value>g</value><a:documentation>Gram</a:documentation>
            <value>g/h</value><a:documentation>Gram per hour</a:documentation>
            <value>h</value><a:documentation>Hour</a:documentation>
            <value>kWh</value><a:documentation>Kilowatt-hour</a:documentation>
            <value>kat</value><a:documentation>Katal</a:documentation>
            <value>kg</value><a:documentation>Kilogram</a:documentation>
            <value>km</value><a:documentation>Kilometer</a:documentation>
            <value>km/h</value><a:documentation>Kilometer per hour</a:documentation>
            <value>lm</value><a:documentation>Lumen</a:documentation>
            <value>lx</value><a:documentation>Lux</a:documentation>
            <value>m</value><a:documentation>Meter</a:documentation>
            <value>mm</value><a:documentation>Millimeter</a:documentation>
            <value>mmÂ</value><a:documentation>Square Millimeter</a:documentation>
            <value>mol</value><a:documentation>Mole</a:documentation>
            <value>rad</value><a:documentation>Radian</a:documentation>
            <value>s</value><a:documentation>Second</a:documentation>
            <value>sr</value><a:documentation>Steradian</a:documentation>
            <value>t</value><a:documentation>Ton</a:documentation>
            <value>Â</value><a:documentation>Degree</a:documentation>
            <value>ÂC</value><a:documentation>Degree Celsius</a:documentation>
            <value>Î</value><a:documentation>Ohm</a:documentation>
        </choice>
    </attribute>
    <attribute name="sign" a:defaultValue="+">
        <choice>
            <value>+</value><a:documentation>Plus (positive number)</a:documentation>
            <value>â</value><a:documentation>Minus (negative number)</a:documentation>
            <value>Â</value><a:documentation>Plus-Minus</a:documentation>
            <value><</value><a:documentation>Lower-than</a:documentation>
            <value>></value><a:documentation>Greater-than</a:documentation>
        </choice>
    </attribute>
    <optional>
        <attribute name="show-unit" a:defaultValue="yes">
            <choice>
                <value>yes</value>
                <value>no</value>
            </choice>
        </attribute>
    </optional>
    <optional>
        <attribute name="system" a:defaultValue="si">
            <choice>
                <value>si</value><a:documentation>International System of Units</a:documentation>
                <value>imperial</value><a:documentation>Imperial System</a:documentation>
                <value>si+imperial</value><a:documentation>SI + Imperial</a:documentation>
            </choice>
        </attribute>
    </optional>
    <optional>
        <attribute name="scope">
            <choice>
                <value>external</value>
                <value>local</value>
                <value>peer</value>
                <value>-dita-use-conref-target</value>
            </choice>
        </attribute>
    </optional>
    <optional>
        <attribute name="outputclass"/>
    </optional>
</define>

Thanks a lot in advance

Stefan

Dometic Germany Holding GmbH – Betriebsstätte Emsdetten, Hollefeldstr. 63, 48282 Emsdetten Germany

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