From p.s.tilma at knid.nl  Tue Feb  2 15:45:02 2021
From: p.s.tilma at knid.nl (p.s.tilma@knid.nl)
Date: Wed Feb  3 04:24:34 2021
Subject: [xsd-users] Reading and writing sensor data from and to XML
Message-ID: <4a586eda-0512-63df-276d-a4a0877ece16@knid.nl>

Anjum, 2 february 2021

Hello everybody,

I am busy with a project in which field sensor data has to be read from
or written to a XML file. For my project I compiled all necessary XML
schema files with xsdcxx cxx-tree. The generated *.cxx and *.hxx files
are then added to my project. After compilation and linking I have a
working application. In this application I have a button for parsing
and (after modification) serialising to a xml file, and a button for
creating an object model from scratch.

Parsing and serialising seem to work, but there is a problem. When I print
the output in a textbox I do not see the data *0,5 10,2 50,2 80,5 100,15*
(see element <swe:values> below) in the generated XML.

The relevant part of my XML file :
 ??????? <measuredData>
 ??????????? <swe:description>Measurement error vs.
temperature</swe:description>
 ??????????? <swe:elementCount>
 ????????????? <swe:Count>
 ??????????????? <swe:value>5</swe:value>
 ????????????? </swe:Count>
 ??????????? </swe:elementCount>
 ??????????? <swe:elementType name="point">
 ????????????? <swe:DataRecord>
 ??????????????? <swe:label>Error vs. Temperature</swe:label>
 ??????????????? <swe:field name="temp">
<swe:Quantitydefinition="http://sweet.jpl.nasa.gov/2.0/physThermo.owl#Temperature">
 ??????????????????? <swe:label>Temperature</swe:label>
 ??????????????????? <swe:uom code="Cel"/>
 ????????????????? </swe:Quantity>
 ??????????????? </swe:field>
 ??????????????? <swe:field name="error">
 ????????????????? <swe:Quantity
definition="http://sweet.jpl.nasa.gov/2.0/sciUncertainty.owl#Error">
 ??????????????????? <swe:label>Relative Error</swe:label>
 ??????????????????? <swe:uom code="%"/>
 ????????????????? </swe:Quantity>
 ??????????????? </swe:field>
 ????????????? </swe:DataRecord>
 ??????????? </swe:elementType>
 ??????????? <swe:encoding>
 ????????????? <swe:TextEncoding blockSeparator=" " tokenSeparator=","/>
 ??????????? </swe:encoding>
 ??????????? <swe:values>*0,5 10,2 50,2 80,5 100,15*</swe:values>
 ??????? </measuredData>

So my first question is : how do I read or write the contents (sensor data)
of element <swe:values>

Another question : I am also trying to create an object model from scratch.
But during serialising the application crashes. How can you display errors
which occur during serialisation.

Attached : swe-profile.xsd

Hopefully you can give me some hints or tips.
Kind regards from
Pier Tilma
Anjum
The Netherlands

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From boris at codesynthesis.com  Mon Feb  8 06:33:22 2021
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Mon Feb  8 06:38:29 2021
Subject: [xsd-users] Reading and writing sensor data from and to XML
In-Reply-To: <4a586eda-0512-63df-276d-a4a0877ece16@knid.nl>
References: <4a586eda-0512-63df-276d-a4a0877ece16@knid.nl>
Message-ID: <boris.20210208132217@codesynthesis.com>

p.s.tilma@knid.nl <p.s.tilma@knid.nl> writes:

> Parsing and serialising seem to work, but there is a problem. When I print
> the output in a textbox I do not see the data *0,5 10,2 50,2 80,5 100,15*
> (see element <swe:values> below) in the generated XML.

Here is the type of this element:

    <complexType name="EncodedValuesPropertyType">
        <complexContent mixed="true">
            <extension base="anyType">
                <attributeGroup ref="swe:AssociationAttributeGroup"/>
            </extension>
        </complexContent>
    </complexType>

As you can see it has mixed content (meaning elements and be mixed
with text in any order) and it derives from anyType (meaning that
it can contain any nested elements). So, in effect, this element can
contain anything. Naturally, there is no statically-typed mapping
for something like this so you will have to deal with it yourself.
There are several ways to do it as shown in the following examples
(part of the XSD package):

examples/cxx/tree/order/mixed/
examples/cxx/tree/custom/mixed/
examples/cxx/tree/mixed/


> Another question : I am also trying to create an object model from scratch.
> But during serialising the application crashes. How can you display errors
> which occur during serialisation.

That depends on why it is crashing. If it's due to a C++ exception, then
you can try to catch and print it to get more information (see "Error
Handling" sections in the documentation for details). If it crashed for
other reasons (e.g., access violation, etc), then you will need to use
a debugger.