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From "Jim Gomes (JIRA)" <jira+amq...@apache.org>
Subject [jira] Closed: (AMQNET-230) Xml Message Encoding should not add Byte Order Mark (BOM) into TextMessage field
Date Tue, 09 Feb 2010 01:13:32 GMT

     [ https://issues.apache.org/activemq/browse/AMQNET-230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Gomes closed AMQNET-230.
----------------------------


> Xml Message Encoding should not add Byte Order Mark (BOM) into TextMessage field
> --------------------------------------------------------------------------------
>
>                 Key: AMQNET-230
>                 URL: https://issues.apache.org/activemq/browse/AMQNET-230
>             Project: ActiveMQ .Net
>          Issue Type: Bug
>          Components: NMS
>    Affects Versions: 1.2.0
>            Reporter: Jim Gomes
>            Assignee: Jim Gomes
>             Fix For: 1.3.0
>
>
> The XmlSerializer in XmlUtl is adding a Byte Order Mark (BOM) as it is marshaling XML
messages.  The BOM is being added because it is using a MemoryStream as the underlying buffer
mechanism.  Technically, adding a BOM mark to a typed field is incorrect.  The message body
of a TextMessage is typed as a Unicode string, therefore no BOM should be added.  Adding a
BOM breaks inter-platform compatibility with other clients.  The following is taken from the
Unicode FAQ (http://unicode.org/faq/utf_bom.html):
> {quote}
> Q: Why wouldn't I always use a protocol that requires a BOM?
> A: Where the data is typed, such as a field in a database, a BOM is unnecessary. In particular,
if a text data stream is marked as UTF-16BE, UTF-16LE, UTF-32BE or UTF-32LE, a BOM is neither
necessary nor permitted. Any FEFF would be interpreted as a ZWNBSP.
> Do not tag every string in a database or set of fields with a BOM, since it wastes space
and complicates string concatenation. Moreover, it also means two data fields may have precisely
the same content, but not be binary-equal (where one is prefaced by a BOM).
> {quote}

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