[#BloombergLP-balxml-PrefixStack-lookupNamespacePrefix]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balxml.adoc[balxml]::xref:BloombergLP/balxml/PrefixStack.adoc[PrefixStack]::lookupNamespacePrefix
:relfileprefix: ../../../
:mrdocs:

Return a copy of the specified `prefix` if `prefix` is registered or an empty string if `prefix` is not registered.

== Synopsis

Declared in `<balxml_prefixstack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char const*
lookupNamespacePrefix(std::string_view const& prefix) const;
----

== Return Value

the registered prefix, or an empty string if not registered

== Parameters

[cols="1,4"]
|===
| Name| Description
| *prefix*
| namespace prefix to look up
|===


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