[#BloombergLP-balxml-PrefixStack-lookupNamespaceUri-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balxml.adoc[balxml]::xref:BloombergLP/balxml/PrefixStack.adoc[PrefixStack]::lookupNamespaceUri
:relfileprefix: ../../../
:mrdocs:

Return the URI of the namespace of the specified `nsId` or empty string if not registered&period;

== Synopsis

Declared in `&lt;balxml&lowbar;prefixstack&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
char const*
lookupNamespaceUri(int nsId) const;
----


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