EMPTY content, then the parser
MUST raise an
xml-misc-recommendation.
+In addition, the parser MUST check whether the +following constraints are met. + +
Well-formedness constraints. For each violation to
+one of constraints below, an
+xml-well-formedness-error
+MUST be raised. The list of well-formedness
+constraints is below:
+
Validity constraints. For each violation to
+one of constraints below, an
+xml-validity-error.
+MUST be raised. The list of validity
+constraints is below:
+
Other creteria. For each violation to
+one of constraints below, an
+xml-misc-recommendation
+MUST be raised. The list of constraints is below:
+
For interoperability, if a parameter-entity reference appears in a ++choice,seq, orMixedconstruct, its +replacement text SHOULD contain at least one non-blank +character, and neither the first nor last non-blank character of the +replacement text SHOULD be a connector (|+or,).
External parsed entities SHOULD each begin with a +text declaration.+