relpipe-data/specification.xml
author František Kučera <franta-hg@frantovo.cz>
Thu, 06 Dec 2018 15:13:28 +0100
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<stránka
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	xmlns="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/strana"
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	xmlns:m="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/makro">
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	<nadpis>Specification</nadpis>
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	<perex>Specification of the Relational pipes data format</perex>
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	<pořadí>20</pořadí>
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1bb39595a51c genrování hlavní nabídky #1
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ab9099ff88fa vkládání zápatí, jmenné prostory, saxon
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	<text xmlns="http://www.w3.org/1999/xhtml">
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		<p>
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			Currently only fragments of the specification are published
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			and the incompatible changes might (and will) come before the v1.0.0 release.
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			Please stay tuned for this stable version which will deliver specification such complete and precise 
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			that independent implementation of the format will be possible.
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25dec6931f18 Lepší odsazení, tabulátory.
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		</p>
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		<h2>
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			<m:name/> data format
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		</h2>
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		<h3>Stream structure structure</h3>
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		<m:tabulka>
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			id	name	description
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			0x1D	start	start of the relation
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			0x1E	record	start of the record
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		</m:tabulka>
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		<h3>Data types</h3>
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		<p>Currently, there are only three data types.</p>
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		<m:tabulka>
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			typeId	code	description
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			0x01	boolean	logical value, true/false
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			0x02	integer	unsigned integer number of arbitrary length
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			0x03	string	character string in UTF-8
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		</m:tabulka>
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		<h2>Libraries</h2>
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		<h3>relpipe-lib-writer</h3>
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		<p>Wraps an output stream (usually STDOUT), accepts method calls (relations, attributes) and generates <m:name/> data on the stream.</p>
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		<h3>relpipe-lib-reader</h3>
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		<p>
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			Wraps an input stream (usually STDIN). The caller creates and sets handlers (zero or more) using <code>addHandler()</code> and then calls <code>process()</code> method.
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			During this method call, the reader reads the input and calls the handlers.
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			Handlers receive relations and attributes.
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		</p>
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		<h2>Tools</h2>
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		<h3>relpipe-in-cli</h3>
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		<p>
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			A tool that generates a single relation. If we want more relations in a single stream, we just call this command multiple times:
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		</p>
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		<m:pre jazyk="bash"><![CDATA[
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(relpipe-in-cli ... ; relpipe-in-cli ... ; relpipe-in-cli ... ) | relpipe-out-tabular
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]]></m:pre>
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		<p>Or concatenate several files or do a combination of both files and commands.</p>
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		<p>This command accept these arguments:</p>
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		<ul>
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			<li>relation name</li>
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			<li>attribute count</li>
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			<li>names of attributes</li>
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			<li>types of attributes</li>
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			<li>attribute values</li>
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		</ul>
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		<p>
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			These data might be passed as CLI arguments on the command line or as null-byte (<code>\0</code>) separated list of values on STDIN.
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			Both ways can be combined e.g. pass relation name and metadata as CLI arguments and the data on STDIN.
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			The tool simply starts with CLI arguments (if any) and continues with values from STDIN (if any).
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		</p>
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		<p>
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			This tool is a good entry point to the <m:name/> world because it requires no programming and construction of the argument list or <code>\0</code> separated list can be done in any language or environment.
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			Tools like <code>perl</code> or <code>tr</code> can convert almost any data to this form and pass it to <code>relpipe-in-cli</code>.
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		</p>
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		<h3>relpipe-in-fstab</h3>
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		<p>
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			A tool that parses <code>fstab</code> (or <code>mtab</code>) file containing a list of devices, mount-points and their options and generates a single relation from it.
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		</p>
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		<p>
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			If executed on TTY, it reads data from the default location: <code>/etc/fstab</code>.
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			If executed with STDIN attached to a file or another command (in a pipe), it reads data from this stream.
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		</p>
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		<h3>relpipe-out-tabular</h3>
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		<p>
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			A tool that formats relational data as tables with unicode borders and ANSI colors.
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			Good for viewing relational data in a terminal or redirecting such view to a file or clipboard (to be pasted anywhere, where fixed-width font is used).
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		</p>
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		<h3>relpipe-out-gui</h3>
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		<p>
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			A tool that views relational data in a GUI window. Relations are displayed as panels with tables.
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			Particular implementation might offer also additional features like chart drawing or simple statistics (sum, max, min, avg, percentiles etc.)
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		</p>
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		<h3>relpipe-out-nullbyte</h3>
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		<p>
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			A tool that converts relational data to a list of null-byte (<code>\0</code>) separated values.
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			Makes sense only for a single relation because boundaries between relations will be lost if there are more of them.
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			Also attribute names and types are lost by default.
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		</p>
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		<p>
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			Is suitable for passing a single relation to <code>xargs --null --max-args=X</code> (where X is the attribute count)
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			or other command that accepts values separated by a null-byte.
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		</p>
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		<h3>relpipe-out-xml</h3>
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		<p>
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			A tool that converts relational data to its XML representation.
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			Is useful for further processing in other tools (e.g. XSLT procesor that generates XHTML org other XML-based format)
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			or for storage of relational data in a text form (good for version control systems, diff, manual editation or review).
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		</p>
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		<h3>relpipe-out-ods</h3>
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		<p>
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			A tool that converts relational data to its ODS (OpenDocument) representation resp. its <em>flat</em> variant (a single XML file instead of a ZIP containing many files).
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			This OpenDocument output can be opened in tools like LibreOffice and further processed (add charts, calculations etc.).
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		</p>
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		<h3>relpipe-tr-validator</h3>
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		<p>
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			A tool that behaves like <code>cat</code>, <code>dd</code> or <code>pv</code> commands i.e. reads data from STDIN and outputs the same data on STDOUT.
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			But compared to these tools, data are parsed and then converted back to the <m:name/> format.
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			Thus if the input was not in this format, the process fails (exit code != 0).
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			Errors (if any) are reported on STDERR.
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		</p>
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25dec6931f18 Lepší odsazení, tabulátory.
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	</text>
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</stránka>