XMLWriter.LookupPrefix

LookupPrefix(<NamespaceURI>)Type: String.
A namespace URI that a prefix should be found for.Type: String; Undefined.
If no prefix found (no namespace URI correspondence written) Undefined is returned.Searches for a prefix for namespace URI specified.
Thin client, server, thick client, external connection, Mobile application (client), Mobile application (server).The prefix should be corresponding to the namespace specified with XMLWriter.WriteNamespaceMapping or XMLWriter.WriteAttribute.

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