321 lines
15 KiB
HTML
321 lines
15 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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<meta name="DC.Title" content="Conversion of character data" />
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<meta name="abstract" content="The Character Data Representation Architecture (CDRA) system of tags ensures that you can convert character data in a predictable, repeatable way." />
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<meta name="description" content="The Character Data Representation Architecture (CDRA) system of tags ensures that you can convert character data in a predictable, repeatable way." />
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<meta name="DC.Relation" scheme="URI" content="rbagscharrepre.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbagsccsidgenrecom.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Conversion of character data</title>
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</head>
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<body id="rbagschardataconvers"><a name="rbagschardataconvers"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Conversion of character data</h1>
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<div><p>The Character Data Representation Architecture (CDRA) system of
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tags ensures that you can convert character data in a predictable, repeatable
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way.</p>
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<p>Conversion pertains to converting the code points assigned to one or more
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characters in one code page to their corresponding code points in another
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code page. The conversion might cause a single character to map to a sequence
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of characters, or a sequence of characters to map to a single character. Conversion
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should not be equated to translating from one language to another.</p>
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<div class="section"><h4 class="sectiontitle">Conversion methods</h4><p>The following methods are used
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for conversion:</p>
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<ul><li><em>Round-trip conversion.</em> The integrity of all character data is maintained
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from the source coded character set identifier (CCSID) to the target CCSID
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and back to the source. <p>When performing a round-trip conversion, you might
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see incorrect representation of the characters displayed in the target CCSID.
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The integrity is preserved, however. When the characters are converted back
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to the source CCSID, they regain their original hexadecimal values and representation.</p>
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</li>
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<li><em>Enforced subset match conversion (substitution).</em> Characters that
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exist in both the source and target CCSID have their integrity maintained.
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Characters in the source CCSID but not in the target CCSID are replaced. Replaced
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values are also referred to as substitution characters. For EBCDIC encoding,
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these appear on most display stations as a solid block. For ASCII encoding,
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these substitution characters appear differently. <p>This substitution is
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permanent when converting back to the source CCSID because it is not possible
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to retrieve the original hexadecimal values.</p>
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<p>For a list of CCSID conversions
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that result in substitution characters, see the Default conversion that might
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use substitution table.</p>
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</li>
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<li><em>Linguistic conversion.</em> Also known as best-fit conversion, a partial
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mapping is done from the source code page to the target code page. The integrity
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of characters that are in both the target CCSID and the source CCSID are preserved.
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Characters that are not in the target CCSID are mapped to the most culturally
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acceptable alternative for that character. <p>For example, the source CCSID
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might support an A grave ( <img src="la140000.gif" alt="A grave character" />). The target CCSID may not support this character. During the conversion,
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the most linguistically acceptable character (a Latin capital A) is substituted
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for the A grave. After the conversion, characters that are not included in
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the target CCSID are presented to the user as the most linguistically acceptable
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substitution characters. This substitution is permanent. Any loss of character
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integrity is permanent.</p>
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<p>Through an application programming interface
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(API), linguistic conversion is available from any supported single-byte CCSID
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to any other supported single-byte CCSID.</p>
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</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Default conversion that can use substitution</h4><p>The
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default CCSID conversions in this topic use substitution because the character
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sets within the CCSIDs are different.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e58">From CCSID</th>
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<th valign="top" id="d0e60">To CCSID</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e58 ">00037</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00835, 00939, 00948, 01027,
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01043, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00256</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00273</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00277</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00278</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00280</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00284</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00285</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00290</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00833, 00836, 00850 00871, 00897, 00933, 00935, 00937, 00942, 01041</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00297</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00300</td>
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<td valign="top" headers="d0e60 ">00301</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00301</td>
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<td valign="top" headers="d0e60 ">00300, 04396</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00420</td>
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<td valign="top" headers="d0e60 ">04960</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00437</td>
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<td valign="top" headers="d0e60 ">00870, 00871, 00880, 01025</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00500</td>
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<td valign="top" headers="d0e60 ">00290, 00367, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01010,
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01011, 01012, 01013, 01014, 01015, 01016, 01017, 01018, 01019, 01027, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00833</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00290, 00297,
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00500, 00836, 00850, 00871, 00930, 00935, 00937, 00939, 00944, 01027, 01040,
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05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00836</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00290, 00297,
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00500, 00833, 00871, 00903, 00930, 00933, 00937, 00939, 00946, 01027, 01042,
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01115, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00837</td>
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<td valign="top" headers="d0e60 ">00928</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00838</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00871, 00937</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00850</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00870, 00880, 00930, 00933, 00939, 01025, 01027, 01041,
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05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00870</td>
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<td valign="top" headers="d0e60 ">00437, 00880, 00915, 01025, 04951</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00871</td>
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<td valign="top" headers="d0e60 ">00290, 00437, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 01027,
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05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00880</td>
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<td valign="top" headers="d0e60 ">00437, 00850, 00870, 00912, 00915, 04948, 04951</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00897</td>
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<td valign="top" headers="d0e60 ">01027</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00903</td>
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<td valign="top" headers="d0e60 ">00836</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00912</td>
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<td valign="top" headers="d0e60 ">00880, 01025</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00915</td>
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<td valign="top" headers="d0e60 ">00870, 00880</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00930</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00833, 00836, 00850, 00871, 00933, 00935, 00937, 00942, 01041</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00933</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00290, 00297,
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00500, 00836, 00850, 00871, 00930, 00934, 00935, 00937, 00939, 00944, 01027,
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01040, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00934</td>
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<td valign="top" headers="d0e60 ">00933</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00935</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00277, 00278, 00280, 00284, 00285, 00290, 00297, 00500,
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00833, 00871, 00930, 00933, 00936, 00937, 00939, 00946, 01027, 01042, 05026,
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05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00936</td>
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<td valign="top" headers="d0e60 ">00935</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00937</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00930, 00933, 00935, 00938, 00939, 00948, 01027,
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01043, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00938</td>
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<td valign="top" headers="d0e60 ">00937</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00939</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00833, 00836, 00850, 00871, 00933, 00935, 00937, 00942, 01041</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00942</td>
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<td valign="top" headers="d0e60 ">00290, 00930, 00939, 01027, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00944</td>
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<td valign="top" headers="d0e60 ">00833, 00933</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00946</td>
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<td valign="top" headers="d0e60 ">00836, 00935</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">00948</td>
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<td valign="top" headers="d0e60 ">00037, 00937</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01010</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01011</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01012</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01013</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01014</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01015</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01016</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01017</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01018</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01019</td>
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<td valign="top" headers="d0e60 ">00500</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01025</td>
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<td valign="top" headers="d0e60 ">00437, 00850, 00870, 00912, 04948</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01027</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00833, 00836, 00850, 00871, 00933, 00935, 00937, 00942, 01041</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01040</td>
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<td valign="top" headers="d0e60 ">00833, 00933</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01041</td>
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<td valign="top" headers="d0e60 ">00290, 00850, 00930, 00939, 01027, 05026, 05035</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01042</td>
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<td valign="top" headers="d0e60 ">00836, 00935</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01043</td>
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<td valign="top" headers="d0e60 ">00037, 00937</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01114</td>
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<td valign="top" headers="d0e60 ">28709</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">01115</td>
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<td valign="top" headers="d0e60 ">00836</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">04396</td>
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<td valign="top" headers="d0e60 ">00301</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">04948</td>
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<td valign="top" headers="d0e60 ">00880, 01025</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">04951</td>
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<td valign="top" headers="d0e60 ">00870, 00880</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">04960</td>
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<td valign="top" headers="d0e60 ">00420</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">05026</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00833, 00836, 00850, 00871, 00933, 00935, 00937, 00942, 01041</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">05035</td>
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<td valign="top" headers="d0e60 ">00037, 00256, 00273, 00277, 00278, 00280, 00284, 00285, 00297, 00500,
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00833, 00836, 00850, 00871, 00933, 00935, 00937, 00942, 01041</td>
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</tr>
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<tr><td valign="top" headers="d0e58 ">28709</td>
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<td valign="top" headers="d0e60 ">00290, 00833, 00836, 00838, 00930, 00933, 00935, 00939, 00948, 01027,
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01043, 05026, 05035</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbagscharrepre.htm" title="Character representation in the server is controlled by the following elements of the Character Data Representation Architecture (CDRA).">Character representation</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rbagsccsidgenrecom.htm" title="These recommendations are useful when writing globalized applications.">Recommendations and guidelines for using CCSIDs</a></div>
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</div>
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