diff --git a/sandbox/core/dwc_event_2021-08-16.xml b/sandbox/core/dwc_event_2021-08-16.xml
new file mode 100644
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\ No newline at end of file
diff --git a/sandbox/core/dwc_occurrence_2021-08-16.xml b/sandbox/core/dwc_occurrence_2021-08-16.xml
new file mode 100644
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+++ b/sandbox/core/dwc_occurrence_2021-08-16.xml
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diff --git a/sandbox/core/dwc_taxon_2021-08-16.xml b/sandbox/core/dwc_taxon_2021-08-16.xml
new file mode 100644
index 0000000..90492b4
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+++ b/sandbox/core/dwc_taxon_2021-08-16.xml
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diff --git a/sandbox/extension/identification_history_2021-08-16.xml b/sandbox/extension/identification_history_2021-08-16.xml
new file mode 100644
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+++ b/sandbox/extension/identification_history_2021-08-16.xml
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diff --git a/sandbox/extension/measurements_or_facts_2021-08-16.xml b/sandbox/extension/measurements_or_facts_2021-08-16.xml
new file mode 100644
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--- /dev/null
+++ b/sandbox/extension/measurements_or_facts_2021-08-16.xml
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diff --git a/sandbox/extension/resource_relationship_2021-08-16.xml b/sandbox/extension/resource_relationship_2021-08-16.xml
new file mode 100644
index 0000000..076dcbe
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+++ b/sandbox/extension/resource_relationship_2021-08-16.xml
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