Fix parameter value parsing, expression evaluation and the graphviz test fixture

[Ghesselink]

No description provided.

[aothms]

mvdXML parameters are frequently unquoted identifiers or namespaced

codes, e.g. ContextType=Model or CRSName[Value]=EPSG:5555.

Curious to understand what you have been testing with. There isn't a really clear spec for mvdxml, but quoted strings should be the bare minimum I guess..?

[Ghesselink]

@aothms

Curious to understand what you have been testing with. There isn't a really clear spec
for mvdxml, but quoted strings should be the bare minimum I guess..?

I'd think so too, it comes from the ReferenceView_V1-2.mvdxml

python-mvdxml/mvd_examples/officials/ReferenceView_V1-2.mvdxml

Line 8795 in 230f85a

<TemplateRule Parameters="RelatingType=IfcActuatorType;" />

It doesn't seem like an exception

>>> from xml.dom.minidom import parse
>>> doc = parse("mvd_examples/officials/ReferenceView_V1-2.mvdxml")
>>> print([r.attributes["Parameters"].value for r in doc.getElementsByTagNameNS("*", "TemplateRule")][:5])
['RelatingType=IfcActuatorType;', 'PsetName=Pset_ActuatorTypeCommon;', 'PsetName=Pset_ActuatorTypeLinearActuation;', 'PsetName=Pset_ActuatorTypeRotationalActuation;', 'QsetName=Qto_ActuatorBaseQuantities;']

Each of those raises an error in ast.literal_eval(),. It's not an exception it seems, doing a quick check: across the 421
TemplateRule elements there are 436 comparison values and none of them is quoted.