composite types

[QIvan]

Hello!
I have question about difference between composite type, group and message.
But first thank you for this awesome project!

Can I make shorter a schema contains an entity which I want to be able to send as a message, as a part of another message or as a group.
For example I have an asset. In java classes it will be something like this

public class Asset {
    char[] isin;
    char[] name;
}

Obviously I should able to send asset as message.
But asset can be part of quotation

public class Quotation {
    double quotation;
    Asset asset;
}

and a clients portfolio contains a list of assets

public class Portfolio {
    char[] portrolioName;
    Collection<Asset> assets;
}

if I right understood my schema will be something like this:

    <types>
        <composite name="groupSizeEncoding" description="Repeating group dimensions">
            <type name="blockLength" primitiveType="uint16"/>
            <type name="numInGroup" primitiveType="uint16"/>
        </composite>
    </types>
    <types>
        <type name="str" primitiveType="char" length="12"/>
        <type name="quote" primitiveType="double"/>
        <composite name="AssetType">
            <type name="isin" primitiveType="char" length="3"/>
            <type name="name" primitiveType="char" length="3"/>
        </composite>
    </types>


    <sbe:message name="Asset" id="1">
        <field name="isin" id="1" type="str"/>
        <field name="name" id="2" type="str"/>
    </sbe:message>
    <sbe:message name="Quotation" id="2">
        <field name="quotation" id="1" type="quote"/>
        <field name="asset" id="2" type="AssetType"/>
    </sbe:message>
    <sbe:message name="Portfolio" id="3">
        <field name="portrolioName" id="1" type="str"/>
        <group name="assets" id="2" dimensionType="groupSizeEncoding">
            <field name="isin" id="1" type="str"/>
            <field name="name" id="2" type="str"/>
        </group>
    </sbe:message>

In this schema fields isin and name repeats 3 times. Can I create a schema a little bit shorter?

Note that this is only example I know there is better way for this task.

[mjpt777]

It might be better to ask this question on the SBE spec repo. We are providing an implementation.

https://github.com/FIXTradingCommunity/fix-simple-binary-encoding