Question about namespace prefix bindings

On Wed, Jan 6, 2016 at 12:32 PM, Tim Thompson <timathom at gmail.com> wrote: > Hello, > > I have a small database of library catalog records that I am trying to run > some simple queries on, but I'm running into a namespace problem. > > Some docs in the database have the following structure, with a wrapper > collection element and two record elements: > > <marc:collection xmlns:marc="http://www.loc.gov/MARC21/slim" xmlns:xsi=" > http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" > http://www.loc.gov/MARC21/slim > http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd"> > <marc:record type="Bibliographic"> > ... > </marc:record> > <marc:record type="Holdings"> > ... > </marc:record> > </marc:collection> > > But others lack a wrapper collection and have only a single record > element, which also lacks a namespace declaration, like so: > > <marc:record type="Bibliographic"> > ... > </marc:record> > > So, I run the following query (using the DBA query interface): > > declare namespace marc = "http://www.loc.gov/MARC21/slim"; > > let $m := collection("marc-data")/marc:record[@type = "Bibliographic"] > return count($m) > > And the count returns 0. However, if I change the predicate in the let > clause to: > > let $m := collection("marc-data")/*[local-name() = "record"][@type = > "Bibliographic"] > > the count returns 45. > > If I am declaring the namespace in my query prolog and associating it with > the same prefix as the one used in my XML documents, why don't I get the > desired prefix/namespace mapping? I'm probably missing something basic, but > this didn't immediately make sense to me. > > Thank you, > Tim > > > -- > Tim A. Thompson > Metadata Librarian (Spanish/Portuguese Specialty) > Princeton University Library > >

> I see that the documents that lack are namespace > declarations are just not well formed. Actually, I'm a little surprised that > it was possible to save them to the DB in the first place!

> > Thanks, > Tim > > -- > Tim A. Thompson > Metadata Librarian (Spanish/Portuguese Specialty) > Princeton University Library > > > On Wed, Jan 6, 2016 at 12:32 PM, Tim Thompson <timathom at gmail.com> wrote: >> >> Hello, >> >> I have a small database of library catalog records that I am trying to run >> some simple queries on, but I'm running into a namespace problem. >> >> Some docs in the database have the following structure, with a wrapper >> collection element and two record elements: >> >> <marc:collection xmlns:marc="http://www.loc.gov/MARC21/slim" >> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >> xsi:schemaLocation="http://www.loc.gov/MARC21/slim >> http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd"> >> <marc:record type="Bibliographic"> >> ... >> </marc:record> >> <marc:record type="Holdings"> >> ... >> </marc:record> >> </marc:collection> >> >> But others lack a wrapper collection and have only a single record >> element, which also lacks a namespace declaration, like so: >> >> <marc:record type="Bibliographic"> >> ... >> </marc:record> >> >> So, I run the following query (using the DBA query interface): >> >> declare namespace marc = "http://www.loc.gov/MARC21/slim"; >> >> let $m := collection("marc-data")/marc:record[@type = "Bibliographic"] >> return count($m) >> >> And the count returns 0. However, if I change the predicate in the let >> clause to: >> >> let $m := collection("marc-data")/*[local-name() = "record"][@type = >> "Bibliographic"] >> >> the count returns 45. >> >> If I am declaring the namespace in my query prolog and associating it with >> the same prefix as the one used in my XML documents, why don't I get the >> desired prefix/namespace mapping? I'm probably missing something basic, but >> this didn't immediately make sense to me. >> >> Thank you, >> Tim >> >> >> -- >> Tim A. Thompson >> Metadata Librarian (Spanish/Portuguese Specialty) >> Princeton University Library >> >