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2.1.1 Syntax for IRIs The terms delimited by "<>" are IRI references [RFC3987]. They stand for IRIs, either directly, or relative to a base IRI.  IRIs are a generalization of URIs [RFC3986] and are fully compatible with URIs and URLs. SPARQL provides two abbreviation mechanisms for IRIs, prefixed names and relative IRIs. Prefixed names The PREFIX keyword associates a prefix label with an IRI. A prefixed name is a prefix label and a local part, separated by a colon ":". It is mapped to an IRI by concatenating the local part to the IRI corresponding to the prefix. Relative IRIs Relative IRIs are combined with base IRIs as per Uniform Resource Identifier (URI): Generic Syntax [RFC3986] using only the basic algorithm in Section 5.2 . Neither Syntax-Based Normalization nor Scheme-Based Normalization (described in sections 6.2.2 and 6.2.3 of RFC3986) is performed. Characters additionally allowed in IRI references are treated in the same way that unreserved characters are treated in URI references, per section 6.5 of Internationalized Resource Identifiers (IRIs) [RFC3987]. The BASE keyword defines the Base IRI used to resolve relative IRIs per RFC3986 section 5.1.1, "Base URI Embedded in Content". Section 5.1.2, "Base URI from the Encapsulating Entity" defines how the Base IRI may come from an encapsulating document, such as a SOAP envelope with an xml:base directive, or a mime multipart document with a Content-Location header. The "Retrieval URI" identified in 5.1.3, Base "URI from the Retrieval URI", is the URL from which a particular SPARQL query was retrieved. If none of the above specifies the Base URI, the default Base URI (section 5.1.4, "Default Base URI") is used. from http://www.w3.org/TR/rdf-sparql-query/

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String queryString =     "BASE <" + myNS + "> " +     "SELECT DISTINCT ?x1 ?x2 " +     "WHERE { " +     "{?X  <from>  ?x1. " +     "?X  <to>  ?x2. " +     "?X  <come>  <"+num+">.} UNION " +     "{?X  <from>  ?x2. " +     "?X  <to>  ?x1. " +     "?X  <go>  <"+num+">.} " +     "}"; myNSÊÇÄãµÄuri