private Library getExternalNamespace() {
		if (externalNamespace == null) {
			int txId = program.startTransaction("SARIF FunctionMgr");
			try {
				SymbolTable symbolTable = program.getSymbolTable();
				Symbol extLib = symbolTable.getLibrarySymbol("<EXTERNAL>");
				if (extLib == null) {
					externalNamespace =
						symbolTable.createExternalLibrary(Library.UNKNOWN, SourceType.IMPORTED);
				}
			}
			catch (Exception e) {
				log.appendException(e);
			}
			finally {
				program.endTransaction(txId, true);
			}
		}
		return externalNamespace;
	}
Parses a list of {@link Function function} definitions from SARIF and creates
then, adding them to the current {@link Program program}.
<p>
Information from a TYPEINFO_COMMENT is used in preference to information from
RETURN_TYPE and STACK_FRAME/STACK_VARs that are tagged as parameters.
<p>
DTD for the FUNCTION element:

<pre>
<code>
&lt;!ELEMENT FUNCTION (RETURN_TYPE?, ADDRESS_RANGE*, REGULAR_CMT?, REPEATABLE_CMT?, TYPEINFO_CMT?, STACK_FRAME?, REGISTER_VAR*)&gt;
</code>
</pre>

@param result             the parser
@param options
@param monitor            the task monitor
@throws AddressFormatException if any address is not parsable
@throws CancelledException     if the operation is cancelled through the
                               monitor
Ghidra/Features/Sarif/src/main/java/sarif/managers/FunctionsSarifMgr.java