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+Models of SiSU xml 
+[early attempt at modelling, not definitive]
+* xsd - xml schema
+* rnc - relax ng compact format
+* rng - relax ng xml format
+
+* input (markup) formats
+  * sax (.sxs.xml)
+  * dom (.sxd.xml)
+  * node (.sxn.xml)
+
+* output formats
+  * sax (sax.xml)
+  * dom (dom.xml)