There are a couple of ways to do that, depending on your data. I'll give an outline of three ways; if none of them fit, or you need more information, just ask. See also http://pyxb.sourceforge.net/arch_content.html#associating-xml-and-python-objects
(1) Tags and attributes are declared in the schema: Every Python object that represents an element is associated with a complex type which is represented by a class. These classes have two internal class variables: * _AttributeMap is a dictionary where keys are instances of ExpandedName and values are instances of AttributeUse. * _ElementMap is a dictionary where keys are instances of ExpandedName and values are instances of ElementUse. These can be used to locate values by name. Be aware that because they use ExpandedName (http://pyxb.sourceforge.net/arch_namespaces.html#expanded-names), you will not be able to lookup tags by just the local name if the element is qualified within its containing component. (NB: I should provide a public interface to this functionality, but haven't yet.) The use instances encode information about how to retrieve the value of the corresponding attribute or element from a binding instance. So, if you want to iterate through all the elements (attributes) in an instance, you can do: for (k, eu) in instance.typeDefinition()._ElementMap.items(): value = eu.value(instance) Note that the returned value will be a list if the content model allows multiple instance of the element, or if multiple elements have the same local name. Invoking eu.value(instance) is exactly what happens when you use the property interface to dereference instance.tag. Your example implies that the elements have either mixed content, or simple content. In the latter case, you may need to use the value() method on the instance. See examples/content/showcontent.py in the distribution. (2) Tags and attributes are wildcards from the schema: The above assumes that your elements are declared in the schema. If instead they are recognized as wildcards, you use the wildcardElements() method to get a list of those in the order they were encountered in the document, and wildcardAttributeMap() to get a map from ExpandedName to the value of the unrecognized attribute. See tests/drivers/test-wildcard.py:TestWildcard for examples. The values in wildcardElements() are either Python instance documents (if the element could be recognized and translated into a binding instance), or instances of a restricted xml.dom.Node class. (3) Extracting from mixed content: If the body of an element has mixed content, use the content() method on the instance to get a list of alternating text and element values, in document order. Something like: for c in instance.content(): if isinstance(c, pyxb.binding.basis._TypeDefinition_mixin): # Element content pass else: # Text content pass ./bugs/test-200907231924.py has an example. The content() method should always contain, in order, the elements and text of the element's content, as long as the instance was created by PyXB from a document. When instances are created or mutated manually, the content() sequence may not be accurate. Peter Salvatore Leone wrote: > Hi, > > I'm using pyxb and seems great, but I have a question. > > I need to get some arbitrary attribute from my xml document. so, if I > have this xml line: > > ... > <tag1 attribute="attribute_value" ...>tag_value</tag1> > <tag2 attribute="attribute_value" ...>tag_value</tag2> > ... > > I need a method for checking the tag_values against another value. Like > this: > > for tag_name in tags: > tag_value = xml.get(tag_name) > > > So, as you see I can't do something like xml.tag1, becouse I don't know > which tag do I have to check... > and will be very helpful something similar for attributes > (tag1.get(attribute_name)) > > Is this possible with pyxb? Am I missing something? > > > Regards, > Salvatore > > > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry® Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9-12, 2009. Register now! > http://p.sf.net/sfu/devconf > _______________________________________________ > pyxb-users mailing list > pyxb-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pyxb-users > ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ pyxb-users mailing list pyxb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyxb-users
