public void populateExecutableXref() {
		if (exerec.isEmpty()) {
			return;
		}
		if (exerec.first().getXrefIndex() == 1) {
			return; // Already been populated
		}
		int xrefIndex = 1;
		for (ExecutableRecord exe : exerec) {
			exe.setXrefIndex(xrefIndex);
			xrefIndex += 1;
		}
	}
Assign an internal id to all executables for purposes of cross-referencing in XML
Indices are assigned in order starting at 1 (0 indicates an index has NOT been assigned)
Ghidra/Features/BSim/src/main/java/ghidra/features/bsim/query/description/DescriptionManager.java