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TIBCO Rendezvous® 8.7.0

# Update XML Byte Sequence

Convenience Method

## Declaration

    TibrvStatus updateXml(
        const char*    fieldName,
        const void*    value,
        tibrv_u32      size,
        tibrv_u16      fieldId=0);

## Purpose

Update a field containing an XML byte sequence.

## Remarks

This convenience method locates a field (by name or identifier) and updates its data.

The type of the existing field (within the message) and the type of the updating `value` must match. The size can change.

Pointer data previously extracted from the field remain valid and unchanged until the message is destroyed; that is, even updating the field’s value does not invalidate pointer data. (See Pointer Snapshot.)

XML data is a byte sequence. Adding (or updating) a field of type TIBRVMSG_XML compresses the bytes. Extracting data from the field uncompresses it to obtain the original byte sequence.

Parameter | Description
`fieldName` | Update a field with this name.
`value` | Update the message field to this value. The method copies the new value into the existing field.
`size` | The program supplies the size of the new data in this parameter.
`fieldId` | Update the field with this identifier. Zero is a special value that signifies no field identifier. It is illegal to add a field that has both a `NULL` field name, and a non-zero field identifier.

## See Also

Field Names and Field Identifiers

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