Errors parsing SBML Spatial using the experimental package

[danv61]

The following models fail, with the message "... Failed to create file .....sedml
The real causes, reported by python, are as follows:

ValueError: The SED document is invalid.

• Model without_PDE4A is invalid.
  • The model file biomodel_32579611_without_PDE4A.xml is invalid.

---

There are 3 categories of errors:

  - The arguments to the following MathML constructs must have a numeric type: <plus>, <minus>, <times>, <divide>, <power>, <root>, <abs>, <exp>, <ln>, <log>, <floor>, <ceiling>, <factorial>, <sin>, <cos>, <tan>, <sec>, <csc>, <cot>, <sinh>, <cosh>, <tanh>, <sech>, <csch>, <coth>, <arcsin>, <arccos>, <arctan>, <arcsec>, <arccsc>, <arccot>, <arcsinh>, <arccosh>, <arctanh>, <arcsech>, <arccsch>, <arccoth>. 
    Reference: L3V1 Section 3.4.9
     The formula '832.169866109964 * and(gt(y, 1), lt(y, 20.9))' in the math element of the <initialAssignment> uses an argument to a operator that expects a numeric value.

  - The MathML formulas in the following elements must yield numeric expressions: <math> in <kineticLaw>, <stoichiometryMath> in <speciesReference>, <math> in <initialAssignment>, <math> in <assignmentRule>, <math> in <rateRule>, <math> in <algebraicRule>, and <delay> in <event>, and <math> in <eventAssignment>. 
    Reference: L3V1 Sections 4.8, 4.9, 4.11 and 4.12
     The formula '832.169866109964 * and(gt(y, 1), lt(y, 20.9))' in the math element of the <initialAssignment> does not return a numeric result.

  - The value of the attribute 'spatial:coordinateBoundary' of a <boundaryCondition> object must be the identifier of an existing <boundary> object defined in the enclosing <model> object.
    Reference: L3V1 Spatial V1 Section
     A <boundaryCondition> has a value of 'Xmin' for its 'coordinateBoundary', but the <geometry> does not contain a <boundaryMax> or <boundaryMin> with that id.

biomodel_6436213
biomodel_12119723
biomodel_26454052
biomodel_27071354
biomodel_27072412
biomodel_27072419
biomodel_27072426
biomodel_28730491
biomodel_32579611
biomodel_36275161
biomodel_40883478
biomodel_50584157
biomodel_61340695
biomodel_74924130
biomodel_82065439
biomodel_82798486
biomodel_82799056
biomodel_82799247
biomodel_82799266
biomodel_84985561
biomodel_91986407
biomodel_92705462
biomodel_95674618
biomodel_95686613
biomodel_95693513
biomodel_95693624
biomodel_95706942
biomodel_95707047
biomodel_101963252
biomodel_102061382
biomodel_116704767
biomodel_116898182
biomodel_123269480
biomodel_123465498
biomodel_123465505
biomodel_124562627
biomodel_147699816
biomodel_156134818
biomodel_189321805
biomodel_200301683
biomodel_201022999
biomodel_203656156