diff --git a/resources/schema/Makefile b/resources/schema/Makefile
new file mode 100644
index 0000000..c3d55bd
--- /dev/null
+++ b/resources/schema/Makefile
@@ -0,0 +1,14 @@
+TRANG=trang
+
+schemas := $(wildcard *.rnc)
+schemas_rng := $(schemas:.rnc=.rng)
+
+.PHONY: all clean
+
+%.rng: %.rnc
+	$(TRANG) $< $@
+
+all: $(schemas_rng)
+
+clean:
+	rm -rf $(schemas_rng)
diff --git a/resources/schema/abacus_export.rnc b/resources/schema/abacus_export.rnc
new file mode 100644
index 0000000..5f13385
--- /dev/null
+++ b/resources/schema/abacus_export.rnc
@@ -0,0 +1,80 @@
+default namespace = ""
+
+start =
+   element AbaConnectContainer {
+      element Task {
+         element Parameter { empty },
+         element Transaction {
+            element DocumentData {
+               attribute command { xsd:NCName },
+               element artikel_nr { xsd:NCName },
+               title,
+               element MetaData {
+                  element dc {
+                     title,
+                     element creator { xsd:string { minLength="1" } }?,
+                     # make sure the contents of the source element is a text node that has either a
+                     # proper isbn number or is the empty string
+                     element source { xsd:token { pattern='keine|SBS[0-9]{6}|(978-|979-)?\d{1,5}-\d{1,7}-\d{1,6}-[0-9xX]' }? }?,
+                     element language { "de" | "de-CH" | "it" | "rm-sursilv"},
+                     element identifier { xsd:NCName },
+                     element date { xsd:date }
+                  },
+                  element sbs {
+                     element KST { xsd:positiveInteger }
+                   & element Korrekturstufe { text }?
+                   & element ProduktArt { text }?
+                   & element untertitel { text }?
+                   & element reihe { text }?
+                   & element verlag { xsd:token }?
+                   & element verlagsort { xsd:token }?
+                   & element auflageJahr { xsd:token }?
+                   & element verlagNR { xsd:token }?
+                   & element opusNr { xsd:token }?
+                   & element ismn { xsd:token }?
+                   & element printPageNumber { xsd:nonNegativeInteger }?
+                   & element ausleihNr { text }?
+                   & element prodStatus { xsd:token }?
+                   & element datenErhalten { xsd:token }?
+                   & element schriftart { xsd:token }?
+                   & element endformat { text }?
+                   & element drucker { xsd:token }?
+                   & element doppelseitig { xsd:NCName }?
+                   & element bindung { xsd:token }?
+                   & element breite { xsd:nonNegativeInteger }
+                   & element zeilen { xsd:nonNegativeInteger }
+                   & element auszug { text }?
+                   & element zoom { text }?
+                   & element qualitaet { text }?
+                   & element prodPageSS { xsd:integer }
+                   & element bpz { text }?
+                   & element ervNr { xsd:integer }
+                   & element laufzettelNr { xsd:nonNegativeInteger }
+                   & element rucksackNr { xsd:nonNegativeInteger }
+                   & element altersgruppe { text }?
+                   & element gdBuchNr { xsd:nonNegativeInteger }
+                   & element prodPagePS { xsd:nonNegativeInteger }
+                   & element anzahlBaende { xsd:nonNegativeInteger }
+                   & element anzahlRelief { xsd:nonNegativeInteger }
+                   & element vorlageHaus { "ja" | "nein" }
+                   & element katalogEintrag { "ja" | "nein" }
+                   & element verlagVerzeichnis { "ja" | "nein" }
+                   & element daisy_producer { "ja" | "nein" }
+                   & element notizen { text }?
+                   & element Aufwand_A2 { "" | "D" }?
+                     # the verkaufstext contains "author[xx]title[xx]subtitleN[xx]..." 
+                     # the export from abacus also optionaly contains new lines, hence the '\n?
+                   & element verkaufstext { xsd:token { pattern='.*\n?\[xx\].+(\n?\[xx\].+)*' }? }?
+                   & element bilder { "ja" | "nein" }?
+                   & element anzahlBilder { xsd:nonNegativeInteger }?
+                  },
+                  element ncc {
+                     element setInfo { xsd:integer }
+                  }
+               }
+            }
+         }
+      }
+   }
+title = element title { text }
+