Hi Barton,

Control-number is the index on 001. 001 should have the number and 003 the MarcOrgCode, that's why it's stripped from $w for search. I don't know about OCLCs practices, so can't tell how numbers are handled there. The examples here show a number with ocm in 001:

http://www.loc.gov/marc/bibliographic/bd001.html

The description for $w (http://www.loc.gov/marc/bibliographic/bd76x78x.html) doesn't have a matching example:

"System control number of the related record preceded by the MARC code, enclosed in parentheses, for the agency to which the control number applies."

Hope this helps,

Katrin

I'm working on generating links for 7XX linking fields in XSLT, a-la Bug 15140 - Add MARC21 776 to OPAC and staff display (https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15140).

This Takes the 773$w, and uses the XSLT template 'extractControlNumber' which strips the leading MARCOrgCode, e.g. turning 

(OCoLC)2776588 into 2776588 ... and then the search URL is

/cgi-bin/koha/opac-search.pl?q=Control-number:2776588

The problem is that 2776588 isn't the actual OCLC number -- The formatting rules are here: https://help.oclc.org/Metadata_Services/OCLC-MARC_records/Content_designators_for_bibliographic_data/20Bibliographic_record_control_fields

In short: 0-8 digits: 0 pad to 8 digits, prepend 'ocm': 

2776588 -> ocm02776588

9 digits, prepend 'ocn'

> 9 digits, prepend 'on'

I tried formatting the search with a leading '*':

/cgi-bin/koha/opac-search.pl?q=Control-number:*2776588

as well as with leading and trailing '*'

/cgi-bin/koha/opac-search.pl?q=Control-number:*2776588*

Neither of these worked.

Formatting the control number according to the OCLC rules above did work:

/cgi-bin/koha/opac-search.pl?q=Control-number:ocm02776588

So I have three questions:

1) Is there a way to format a Control-number search that doesn't force me to generate the control number according to the OCLC rules above?

2) If not, does anyone have pointers about how to

* Test for (OCoLC) ->
  * Test length of control number

    * < 9 -> 0 pad to 8 digits, prepend 'ocm'

    * 9  -> prepend 'ocn'

    * > 9  -> prepen 'on'

3) Are there other control number formatting rules for other MARCOrgCodes? 

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