You've got a pretty complex schema there. Part of the problem is that it
allows you a lot of latitude.
A JDFProcessNode, via the JDFChildElements_ group, includes an optional
ResourcePool element, which in turn is one of the elements of an unbounded
sequence. What this means is that a JDF element can have multiple
ResourcePool elements inside it. That's why you got two of them in the
first attempt: you appended two objects that could be converted (using
pyxb.BIND) into ResourcePool elements by synthesizing a ResourcePool
element from a value that can be content within a ResourcePool element.
It's also why you can't assign a single ResourcePool directly to the
JDF.ResourcePool attribute: that attribute requires a plural value (the
diagnostic is clearly misleading; the clue is in the exception name).
pyxb.BIND can synthesize the right kind of element given parameters that
could have been passed to that element's "constructor", but it can't
synthesize a list of such elements.
If you only want one, start with one, as you did, and append it to the
list. Then work with that one.
Below is how I might express the code I think you're trying to get:
import jdf.JDF as jdf
jo = jdf.JDF(ID='job123456', Type='Combined', Status='Waiting')
# jo supports multiple ResourcePool elements. Use one, and add it to
# the JDF object.
rp = jdf.ResourcePool()
jo.ResourcePool.append(rp)
# Create a Media and add it to the pool
mo = jdf.Media(ID='main', Class='Consumable', Status='Available')
rp.append(mo)
# Then add another
rp.append(jdf.Media(ID='perf', Class='Consumable', Status='Available'))
print jo.toDOM().toprettyxml()
Or:
jo = jdf.JDF(ID='job123456', Type='Combined', Status='Waiting')
rp = jdf.ResourcePool(jdf.Media(ID='main', Class='Consumable',
Status='Available'),
jdf.Media(ID='perf', Class='Consumable',
Status='Available'))
jo.ResourcePool.append(rp)
Both give you the same XML:
llc[134]$ python test.py
<?xml version="1.0" ?>
<ns1:JDF ID="job123456" Status="Waiting" Type="Combined" xmlns:ns1="
http://www.CIP4.org/JDFSchema_1_1";>
<ns1:ResourcePool>
<ns1:Media Class="Consumable" ID="main" Status="Available"/>
<ns1:Media Class="Consumable" ID="perf" Status="Available"/>
</ns1:ResourcePool>
</ns1:JDF>
On Fri, Apr 10, 2015 at 2:55 PM, Kevin Murphy <pkmu...@gmail.com> wrote:
> Hello,
>
> I've been checking out PyXB (1.2.4) for a project I'm working on
> involving the JDF XML schema
> (http://www.cip4.org/Schema/JDFSchema_1_4a/JDF.xsd) and in general I
> think PyXB will be a great help, but I'm stumbling over an understanding
> of how to work with ComplexTypes within the PyXB construct.
>
> Here's a simplified example of something I'm trying to do:
>
> So I'm attempting to construct a basic JDF document, and I got about as
> far as trying to build something that looks like this:
>
> <?xml version='1.0' encoding='UTF-8'?>
> <JDF ID="job123456" Status="Waiting" Type="Combined"
> xmlns="http://www.CIP4.org/JDFSchema_1_1";>
> <ResourcePool>
> <Media Class="Consumable" ID="main" Status="Available"/>
> <Media Class="Consumable" ID="perf" Status="Available"/>
> ...
> </ResourcePool>
> </JDF>
>
> using code like this:
>
> import pyxb
>
> from print_services.jdf.schema import jdf
>
> jdf_obj = jdf.JDF()
>
> jdf_obj.ID = "job123456"
> jdf_obj.Type = "Combined"
> jdf_obj.Status = "Waiting"
>
> media_obj = jdf.Media()
> media_obj.ID = "main"
> media_obj.Class = "Consumable"
> media_obj.Status = "Available"
>
> media_obj2 = jdf.Media()
> media_obj2.ID = "perf"
> media_obj2.Class = "Consumable"
> media_obj2.Status = "Available"
>
> jdf_obj.ResourcePool.append(media_obj)
> jdf_obj.ResourcePool.append(media_obj2)
>
> Which yields:
>
> File "/usr/local/lib/python2.7/site-packages/pyxb/binding/basis.py",
> line 425, in _CompatibleValue
> raise pyxb.SimpleTypeValueError(cls, value)
> pyxb.exceptions_.SimpleTypeValueError: Type
> {http://www.CIP4.org/JDFSchema_1_1}ResourcePool_ cannot be created from
> {http://www.CIP4.org/JDFSchema_1_1}Media_r:
> <print_services.jdf.schema.jdf.Media_r object at 0x109a360d0>
>
> So then I thought... ok, maybe I need to create that ResourcePool object:
>
> jdf_obj.ResourcePool = jdf.ResourcePool()
>
> Nope:
>
> File "/usr/local/lib/python2.7/site-packages/pyxb/binding/basis.py",
> line 1618, in compatibleValue
> raise pyxb.SimplePluralValueError(self.typeDefinition(), value)
> pyxb.exceptions_.SimplePluralValueError: Type
> {http://www.CIP4.org/JDFSchema_1_1}ResourcePool_ cannot be created from
> {http://www.CIP4.org/JDFSchema_1_1}ResourcePool_:
> <print_services.jdf.schema.jdf.ResourcePool_ object at 0x1073436d0>
>
> Ok, then I went back to the documentation again and started looking into
> this pyxb.BIND() thing...
>
> jdf_obj.ResourcePool.append(pyxb.BIND(media_obj))
>
> Hey, that worked!
>
> <?xml version="1.0" ?>
> <ns1:JDF ID="job123456" Status="Waiting" Type="Combined"
> xmlns:ns1="http://www.CIP4.org/JDFSchema_1_1";>
> <ns1:ResourcePool>
> <ns1:Media Class="Consumable" ID="main" Status="Available"/>
> </ns1:ResourcePool>
> </ns1:JDF>
>
> Ok, so let's add a second Media element:
>
> jdf_obj.ResourcePool.append(pyxb.BIND(media_obj2))
>
> No errors, but ... wait, what?
>
> <?xml version="1.0" ?>
> <ns1:JDF ID="job123456" Status="Waiting" Type="Combined"
> xmlns:ns1="http://www.CIP4.org/JDFSchema_1_1";>
> <ns1:ResourcePool>
> <ns1:Media Class="Consumable" ID="main" Status="Available"/>
> </ns1:ResourcePool>
> <ns1:ResourcePool>
> <ns1:Media Class="Consumable" ID="perf" Status="Available"/>
> </ns1:ResourcePool>
> </ns1:JDF>
>
> How did I wind up with two ResourcePool elements?
>
> Hrmm, ok, maybe I need to construct the ResourcePool element first, and
> then assign it into the JDF element?
>
> rp_obj = jdf.ResourcePool()
> rp_obj.append(media_obj)
> rp_obj.append(media_obj2)
>
> print rp_obj.toxml()
>
> <?xml version="1.0" ?>
> <ns1:ResourcePool xmlns:ns1="http://www.CIP4.org/JDFSchema_1_1";>
> <ns1:Media Class="Consumable" ID="main" Status="Available"/>
> <ns1:Media Class="Consumable" ID="perf" Status="Available"/>
> </ns1:ResourcePool>
>
> Looking promising now!
>
> jdf_obj.ResourcePool = rp_obj
>
> File "/usr/local/lib/python2.7/site-packages/pyxb/binding/basis.py",
> line 1618, in compatibleValue
> raise pyxb.SimplePluralValueError(self.typeDefinition(), value)
> pyxb.exceptions_.SimplePluralValueError: Type
> {http://www.CIP4.org/JDFSchema_1_1}ResourcePool_ cannot be created from
> {http://www.CIP4.org/JDFSchema_1_1}ResourcePool_:
> <print_services.jdf.schema.jdf.ResourcePool_ object at 0x10453d6d0>
>
> Shoot. Maybe I need to do that BIND thing?
>
> jdf_obj.ResourcePool = pyxb.BIND(rp_obj)
>
> File "/usr/local/lib/python2.7/site-packages/pyxb/binding/basis.py",
> line 1618, in compatibleValue
> raise pyxb.SimplePluralValueError(self.typeDefinition(), value)
> pyxb.exceptions_.SimplePluralValueError: Type
> {http://www.CIP4.org/JDFSchema_1_1}ResourcePool_ cannot be created from:
> <pyxb.BIND object at 0x1032a5910>
>
>
> Hrmm.........
>
>
> So, I definitely feel like I'm dancing around the solution, it's in
> there somewhere, I just don't really understand enough about how these
> bindings are meant to work and I simply can't find a complete example
> that describes what I'm trying to do. I'm really hoping that someone
> can help me out here and point me in the right direction!
>
> Thanks so much,
> --Kevin
>
>
>
>
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