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

Return ID of the namespace registered for the specified `prefix` or ‐1 if not registered.

== Synopsis

Declared in `<balxml_prefixstack.h>`

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


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