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Hi, I am not sure if this is the right mailing list to ask these questions. I apologize if it is not. I have a couple of questions on CQL and XCQL. In the example given on the XCQL webpage at http://www.loc.gov/z3950/agency/zing/cql/xcql.html The XCQL is only a segment of an XML document. Studying the XCQL schema, I think for CQL statements that start with prefixes, like the example in that page, it seems not possible to create a valid XML document to contain the statement. In another word, the XCQL created only can be a part of a bigger XML document. Does this mean that XCQL is intended to be embedded in a SOAP message or other types of XML documents, rather than be contained in a single XML document? Another question is about how CQL is expected to be used. Right now there are several CQL parsers/compilers but most of them compiles a statement into XCQL. This makes sense since it's easier to parse and analyze an XCQL document semantically. However, how this query should be used to retrieve results from the local index or databases is not defined. Is this left for the SRW/SRU implementers to decide? Hope I made myself clear. Thank you for you help! David Jiao -- Dazhi (David) Jiao System Analyst / Programmer Digital Library Program, Indiana University at Bloomington Tel: 812.856.0089 Email: [log in to unmask]