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Code Editor : sysid.htm
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML Strict//EN"> <HTML> <HEAD> <TITLE>OpenSP - System identifiers</TITLE> </HEAD> <BODY> <H1>System identifiers</H1> <P> There are two kinds of system identifier: formal system identifiers and simple system identifiers. A system identifier that does not start with <SAMP><</SAMP> will always be interpreted as a simple system identifier. A simple system identifier will always be interpreted either as a filename or as a URL. <H2>Formal system identifiers</H2> <P> Formal system identifiers are based on the System Identifier facility defined in ISO/IEC 10744 (HyTime) Technical Corrigendum 1, Annex D. A system identifier that is a formal system identifier consists of a sequence of one or more storage object specifications. The objects specified by the storage object specifications are concatenated to form the entity. A storage object specification consists of an SGML start-tag in the reference concrete syntax followed by character data content. The generic identifier of the start-tag is the name of a storage manager. The content is a storage object identifier which identifies the storage object in a manner dependent on the storage manager. The start-tag can also specify attributes giving additional information about the storage object. Numeric character references are recognized in storage object identifiers and attribute value literals in the start-tag. Record ends are ignored in the storage object identifier as with SGML. A system identifier will be interpreted as a formal system identifier if it starts with a <SAMP><</SAMP> followed by a storage manager name, followed by either <SAMP>></SAMP> or white-space; otherwise it will be interpreted as a simple system identifier. A storage object identifier extends until the end of the system identifier or until the first occurrence of <SAMP><</SAMP> followed by a storage manager name, followed by either <SAMP>></SAMP> or white-space. <P> The following storage managers are available: <DL> <DT> <A NAME="osfile"><SAMP>osfile</SAMP></A> <DD> The storage object identifier is a filename. If the filename is relative it is resolved using a base filename. Normally the base filename is the name of the file in which the storage object identifier was specified, but this can be changed using the <SAMP>base</SAMP> attribute. The filename will be searched for first in the directory of the base filename. If it is not found there, then it will be searched for in directories specified with the <SAMP>-D</SAMP> option in the order in which they were specified on the command line, and then in the list of directories specified by the environment variable <SAMP>SGML_SEARCH_PATH</SAMP>. The list is separated by colons under Unix and by semi-colons under MSDOS. <DT> <SAMP>osfd</SAMP> <DD> The storage object identifier is an integer specifying a file descriptor. Thus a system identifier of <SAMP><osfd>0</SAMP> will refer to the standard input (<CODE>STDIN</code>), 1 to standard output (<code>STDOUT</code>), and 2 to standard error (<code>STDERR</code>). Arbitrary file descriptors may be used so you could say <samp><osfd>3</samp> to get an extra input or output stream independant of the usual three. This is useful, e.g., for generating catalog entries or SGML declarations on the fly. You can use an osfd storage object anywhere you can use a sysid, including on the command line. <DT> <SAMP>url</SAMP> <DD> The storage object identifier is a URL. Only the <SAMP>http</SAMP> scheme is currently supported and not on all systems. <DT> <SAMP>neutral</SAMP> <DD> The storage manager is the storage manager of storage object in which the system identifier was specified (the <I>underlying storage manager</I>). However if the underlying storage manager does not support named storage objects (ie it is <SAMP>osfd</SAMP>), then the storage manager will be <SAMP>osfile</SAMP>. The storage object identifier is treated as a relative, hierarchical name separated by slashes (<SAMP>/</SAMP>) and will be transformed as appropriate for the underlying storage manager. <DT> <SAMP>literal</SAMP> <DD> The bit combinations of the storage object identifier are the contents of the storage object. </DL> <P> The following attributes are supported: <DL> <DT> <SAMP>records</SAMP> <DD> This describes how records are delimited in the storage object: <DL> <DT><SAMP>cr</SAMP> <DD> Records are terminated by a carriage return. <DT> <SAMP>lf</SAMP> <DD> Records are terminated by a line feed. <DT> <SAMP>crlf</SAMP> <DD> Records are terminated by a carriage return followed by a line feed. <DT> <SAMP>find</SAMP> <DD> Records are terminated by whichever of <SAMP>cr</SAMP>, <SAMP>lf</SAMP> or <SAMP>crlf</SAMP> is first encountered in the storage object. <DT> <SAMP>asis</SAMP> <DD> No recognition of records is performed. </DL> <P> The default is <SAMP>find</SAMP> except for NDATA entities for which the default is <SAMP>asis</SAMP>. This attribute is not applicable to the <SAMP>literal</SAMP> storage manager. <P> When records are recognized in a storage object, a record start is inserted at the beginning of each record, and a record end at the end of each record. If there is a partial record (a record that doesn't end with the record terminator) at the end of the entity, then a record start will be inserted before it but no record end will be inserted after it. <P> The attribute name and <SAMP>=</SAMP> can be omitted for this attribute. <DT> <SAMP>zapeof</SAMP> <DD> This specifies whether a Control-Z character that occurs as the final byte in the storage object should be stripped. The following values are allowed: <DL> <DT><SAMP>zapeof</SAMP> <DD> A final Control-Z should be stripped. <DT><SAMP>nozapeof</SAMP> <DD> A final Control-Z should not be stripped. </DL> <P> The default is <SAMP>zapeof</SAMP> except for NDATA entities, entities declared in storage objects with <SAMP>zapeof=nozapeof</SAMP> and storage objects with <SAMP>records=asis</SAMP>. This attribute is not applicable to the <SAMP>literal</SAMP> storage manager. <P> The attribute name and <SAMP>=</SAMP> can be omitted for this attribute. <DT> <A NAME="encoding"><SAMP>encoding</SAMP></A> <DD> The encoding attribute specifies the encoding of the storage object. This attribute is used when the encoding is independent of the document character set. The value must be the <A HREF="charset.htm#encodings">name of an encoding</A>. This attribute is not applicable to the <SAMP>literal</SAMP> storage manager. <DT> <A NAME="bctf"><SAMP>bctf</SAMP></A> <DD> The BCTF attribute specifies that the encoding of the storage object. This attribute is used when the encoding is document character set dependent. The value must be the <A HREF="charset.htm#bctfs">name of a BCTF</A>. This attribute is not applicable to the <SAMP>literal</SAMP> storage manager. <DT> <SAMP>tracking</SAMP> <DD> This specifies whether line boundaries should be tracked for this object: a value of <SAMP>track</SAMP> specifies that they should; a value of <SAMP>notrack</SAMP> specifies that they should not. The default value is <SAMP>track</SAMP>. Keeping track of where line boundaries occur in a storage object requires approximately one byte of storage per line and it may be desirable to disable this for very large storage objects. <P> The attribute name and <SAMP>=</SAMP> can be omitted for this attribute. <DT> <SAMP>base</SAMP> <DD> When the storage object identifier specified in the content of the storage object specification is relative, this specifies the base storage object identifier relative to which that storage object identifier should be resolved. When not specified a storage object identifier is interpreted relative to the storage object in which it is specified, provided that this has the same storage manager. This applies both to system identifiers specified in SGML documents and to system identifiers specified in the catalog entry files. <DT> <SAMP>smcrd</SAMP> <DD> The value is a single character that will be recognized in storage object identifiers (both in the content of storage object specifications and in the value of <SAMP>base</SAMP> attributes) as a storage manager character reference delimiter when followed by a digit. A storage manager character reference is like an SGML numeric character reference except that the number is interpreted as a character number in the inherent character set of the storage manager rather than the document character set. The default is for no character to be recognized as a storage manager character reference delimiter. Numeric character references cannot be used to prevent recognition of storage manager character reference delimiters. <DT> <SAMP>fold</SAMP> <DD> This applies only to the <SAMP>neutral</SAMP> storage manager. It specifies whether the storage object identifier should be folded to the customary case of the underlying storage manager if storage object identifiers for the underlying storage manager are case sensitive. The following values are allowed: <DL> <DT><SAMP>fold</SAMP> <DD> The storage object identifier will be folded. <DT> <SAMP>nofold</SAMP> <DD> The storage object identifier will not be folded. </DL> <P> The default value is <SAMP>fold</SAMP>. The attribute name and <SAMP>=</SAMP> can be omitted for this attribute. <P> For example, on Unix filenames are case-sensitive and the customary case is lower-case. So if the underlying storage manager were <SAMP>osfile</SAMP> and the system was a Unix system, then <SAMP><neutral>FOO.SGM</SAMP> would be equivalent to <SAMP><osfile>foo.sgm</SAMP>. </DL> <H2>Simple system identfiers</H2> <P> A simple system identifier is interpreted as a storage object identifier with a storage manager that depends on where the system identifier was specified: if it was specified in a storage object whose storage manager was <SAMP>url</SAMP> or if the system identifier looks like an absolute URL in a supported scheme, the storage manager will be <SAMP>url</SAMP>; otherwise the storage manager will be <SAMP>osfile</SAMP>. The storage manager attributes are defaulted as for a formal system identifier. Numeric character references are not recognized in simple system identifiers. </BODY> </HTML>
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