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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-B526BA3A-14E4-53B4-9382-437475A1C8A4" xml:lang="en"><title>Patchable Constants</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    13 <p>From version 9.3 of Symbian OS, DLLs can export certain constants. These

    14 are referred to as patchable constants, and you can change their values when

    15 the DLLs from which they are exported are incorporated into a ROM image. </p>

    16 <p>This gives you the ability to create a variety of ROM images with constants

    17 of different values without the need to change any source code nor to rebuild

    18 the DLLs. </p>

    19 <p>You change the value of a constant when you build your ROM image by adding

    20 the patchdata keyword into your <filepath>.oby</filepath> file. </p>

    21 <p>See : <xref href="GUID-49397CFD-955A-5DF6-9251-368C44224966.dita">Build tools

    22 reference</xref> and <xref href="GUID-7FF363B0-B05F-5490-8D9C-59061B905381.dita">How

    23 to build ROMs with variants</xref>. </p>

    24 </conbody></concept>