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Subject: Re: [xacml] IsPresent semantics
http://www.w3.org/TR/xquery-operators/ defines op:anyURI-equal(anyURI $srcval1, anyURI $srcval2) => boolean Returns true if $srcval1 and $srcval2 compare equal on a codepoint-by-codepoint basis. Else returns false. This function backs up the "eq" and "ne" operators on anyURI. It looks to me from earlier in the document as if "codepoint" just means one "character" from the string encoding being used. So this will match character by character. So anyURI-equal will not expand the QNames itself. Unless we find a reference that says QNames in XML attributes MUST be expanded before semantic processing of the XML document, then I guess we need to put this description somewhere. Anne On 29 October, Polar Humenn writes: Re: [xacml] IsPresent semantics > From: Polar Humenn <polar@syr.edu> > To: Simon Godik <simon@godik.com> > Subject: Re: [xacml] IsPresent semantics > Date: Tue, 29 Oct 2002 14:20:08 -0500 (EST) > > > Do we need to put this description somewhere, or can we refer to it as > "QName equality"? > > > On Tue, 29 Oct 2002, Simon Godik wrote: > > > > Q: What about QName equality? See match on DataType. > > > > QName evaluates into expanded name which is a pair: (URI, local_name). > > Expanded name MUST be used in all operations involving DataType attribute of > > the xacml:AttributeDesignator, > > xacml:AttributeSelector, xacml:AttributeValue, and xacml-context:Attribute. > > Two QNames are considered equal iff URI portion of expanded names are equal, > > and local_name portions > > of the expanded names are equal. > > > > Simon > > > > ----- Original Message ----- > > From: "Polar Humenn" <polar@syr.edu> > > To: "XACML" <xacml@lists.oasis-open.org> > > Sent: Tuesday, October 29, 2002 10:26 AM > > Subject: [xacml] IsPresent semantics > > > > > > > > > > I'm writing up the semantics for the *IsPresent elements, and I want your > > > immediate feed back for this ResourceAttributeIsPresent text, as the other > > > elements will just probably be a cut and paste of it with the names > > > changed. > > > > > > Note, that this text should also apply to the *AttributeDesignator > > > elements as well, as they are close counterparts. > > > > > > Q: What about QName equality? See match on DataType. > > > > > > > > > > > > 5.1.x Element <ResourceAttributeIsPresent> > > > > > > The <ResourceAttributeIsPresent> element SHALL result in true if the > > > named resource attribute can be located from within the <Resource> > > > element of the <xacml-context:Request> element. A result of true SHALL > > > mean that an <ResourceAttributeDesignator> element for this named > > > attribute will return a bag consisting of at least one attribute value. > > > The MustBePresent attribute governs whether this element returns false > > > or indeterminate in the case of finding no value for the named attribute > > > in the request context. In this case, if the MustBePresent attribute is > > > set to false, which is its default value, this element SHALL result in > > > false. However, for this case, if the MustBePresent attribute is set to > > > true, the expression SHALL result in indeterminate. Regardless of the > > > MustBePresent attribute, if it cannot be determined whether the > > > attribute is present or not present in the request context, or the value > > > of the attribute is unavailable, then the expression SHALL result in > > > indeterminate. > > > > > > A resource attribute SHALL be considered present if at least one > > > attribute exists within the <Resource> in the <xacml-context:Request> > > > element that matches the values of their corresponding AttributeId, > > > DataType, and Issuer attributes. The AttributeId attribute MUST match, > > > by string equality on the URIs, that of the AttributeId attribute of the > > > <xacml-context:Attribute> element. The DataType attribute MUST match, by > > > string [Qname?] equality, that of the DataType attribute of the same > > > <xacml-context:Attribute> element. If the Issuer attribute of this > > > <ResourceAttributeIsPresent> element is supplied, it MUST match, by > > > string equality, the Issuer attribute of the same > > > <xacml-context:Attribute> element. If the Issuer attribute of this > > > <ResourceAttributeIsPresent> element is not supplied, presence SHALL be > > > governed by AttributeId and DataType attributes alone, regardless of the > > > Issuer attribute of the same <xacml-context:Attribute> element even if > > > the Issuer attribute is not supplied in the located > > > <xacml-context:Attribute> element. > > > > > > The <ResourceAttributeIsPresent> MAY be passed to the <Apply> element as > > > an argument. > > > > > > <xs:element name="ResourceAttributeIsPresent" > > > type="xacml:AttributeDesignatorType"/> > > > > > > The <ResourceAttributeIsPresent> element is of the > > > AttributeDesignatorType complex type. > > > > > > The <ResourceAttributeIsPresent> element has the following attributes: > > > > > > AttributeId [Required] > > > > > > This attribute SHALL specify the AttributeId of which to match the > > > attribute. > > > > > > DataType [Required] > > > > > > This attribute SHALL specify the DataType of which to match the > > > attribute. > > > > > > Issuer [Optional] > > > > > > This attribute, if supplied, SHALL specify the Issuer of which to > > > match the attribute. > > > > > > MustBePresent [Optional] > > > > > > This attribute, if set to "false," specifies that this element SHALL > > > result in false if no matching attributes can be found. This > > > attribute, if set to "true," specifies that this element SHALL > > > result in indeterminate if no matching attributes can be found. If > > > this attribute is not supplied, its default value SHALL be "false". > > > > > > > > > > > > ---------------------------------------------------------------- > > > To subscribe or unsubscribe from this elist use the subscription > > > manager: <http://lists.oasis-open.org/ob/adm.pl> > > > > > > > > > > > > > > > ---------------------------------------------------------------- > > To subscribe or unsubscribe from this elist use the subscription > > manager: <http://lists.oasis-open.org/ob/adm.pl> > > > > > ---------------------------------------------------------------- > To subscribe or unsubscribe from this elist use the subscription > manager: <http://lists.oasis-open.org/ob/adm.pl> > -- Anne H. Anderson Email: Anne.Anderson@Sun.COM Sun Microsystems Laboratories 1 Network Drive,UBUR02-311 Tel: 781/442-0928 Burlington, MA 01803-0902 USA Fax: 781/442-1692
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